Ultimate Mashup Cookies

Irresistible Extra-Large Monster Cookies: The Ultimate Recipe for Chewy, Crunchy Perfection

Prepare yourself for the ultimate cookie experience with these magnificent extra-large monster cookies! Far from your average treat, these colossal cookies are a celebration of textures and flavors, generously packed with an incredible medley of semi-sweet chocolate chips, colorful M&M’s, savory peanuts, hearty rolled oats, and surprisingly delightful crispy rice cereal. Each bite delivers a harmonious blend of chewy, crunchy, and utterly delicious goodness, making them truly irresistible.

A stack of perfectly baked extra-large monster cookies, brimming with chocolate chips, M&Ms, oats, peanuts, and crispy rice cereal, on a cooling rack.

In many homes, classic chocolate chip cookies are a beloved staple, and ours is no exception. However, there are those wonderful moments when the ordinary simply won’t do. Sometimes, the craving hits for something a little more adventurous, a little more extravagant – a cookie that goes beyond the conventional. It’s that feeling when you glance into your pantry and envision all the delightful possibilities: nuts, candies, crunchy cereals, and more, all coming together in one epic treat.

If you’ve ever felt that spontaneous urge to create something truly special, something that uses “everything but the kitchen sink,” then these extra-large monster cookies are your perfect answer. They are designed to satisfy every possible craving, combining a symphony of flavors and textures into a single, substantial cookie. While these cookies are incredibly versatile and allow for countless variations (which we’ll explore further down), this particular combination of semi-sweet chocolate chips, mini M&M’s, chopped peanuts, old-fashioned rolled oats, and crispy rice cereal is a personal favorite. The result is a cookie that is wonderfully thick, incredibly chewy, and boasts a uniquely fun flavor profile with an absolutely fantastic texture that will keep you coming back for more.

A flat lay of various ingredients for monster cookies, including a bowl of rolled oats, chocolate chips, M&Ms, chopped peanuts, and crispy rice cereal.

What Exactly Are Monster Cookies? The Ultimate Cookie Fusion!

Monster cookies live up to their name by being the “monsters” of the cookie world – a delightful amalgamation of several cookie types rolled into one incredibly satisfying creation. They often share a flavor resemblance to peanut butter oatmeal cookies with chocolate, but they are so much more dynamic and playful than that! The beauty of monster cookies lies in their adaptability, with recipes featuring a wide array of mix-ins. For this particular recipe, we’ve carefully selected a combination that guarantees an exceptional taste and texture experience:

  • Old-Fashioned Rolled Oats: These are crucial for the signature chewy texture and hearty bite that defines monster cookies. They add a comforting, wholesome base to the decadent mix.
  • Semi-Sweet Chocolate Chips: A classic for a reason, these chips melt perfectly, creating pockets of rich, bittersweet chocolate throughout each cookie.
  • Mini M&M’s: Beyond just adding more chocolate, mini M&M’s introduce a delightful crunch and a vibrant pop of color, making each cookie visually appealing and extra fun.
  • Chopped Peanuts: The inclusion of peanuts brings a wonderful savory note and a satisfying crunch that beautifully balances the sweetness of the other ingredients, enhancing the overall depth of flavor.
  • Crispy Rice Cereal: This is a secret weapon for texture! Crispy rice cereal adds an unexpected, delicate crunch and a light, airy quality that prevents the cookies from being too dense, creating a truly unique mouthfeel.

Each ingredient plays a vital role, contributing to a complex yet harmonious flavor and texture profile that sets monster cookies apart from other cookie varieties. They are truly a maximalist’s dream, offering something new and exciting in every bite.

A stand mixer in action, mixing cookie dough for monster cookies with a paddle attachment, showing the early stages of combining ingredients.

The Magic Behind the Mix-In Medley: Why These Ingredients Work So Well Together

The genius of monster cookies lies in the thoughtful combination of their diverse ingredients, each chosen to contribute to a perfect symphony of taste and texture. Our recipe carefully balances sweet with savory, and chewy with crunchy, ensuring that every bite is an adventure. The old-fashioned rolled oats provide a grounding chewiness, offering a wholesome contrast to the decadent additions. Semi-sweet chocolate chips melt into blissful pockets of rich flavor, while the mini M&M’s introduce a playful crunch and an extra layer of chocolatey sweetness, along with their iconic colorful shells.

The chopped peanuts are not just for crunch; their inherent saltiness and nutty depth cut through the sweetness, preventing the cookies from being cloyingly rich and adding a sophisticated, savory counterpoint. Finally, the crispy rice cereal is truly the unsung hero, adding a surprising lightness and an irresistible, delicate crackle that elevates the entire cookie. This blend isn’t just a random assortment; it’s a meticulously crafted medley designed to excite your palate and leave you utterly satisfied. It’s this thoughtful layering of components that transforms a simple cookie into an extraordinary “monster” experience.

Variations and Substitutions: Customize Your Monster Cookies to Perfection

One of the most exciting aspects of monster cookies is their incredible adaptability. They are, at their heart, the quintessential “clean out the pantry” cookie, encouraging you to experiment and tailor them to your specific cravings or whatever delightful treasures you happen to have on hand. Don’t feel limited by our suggestions; let your imagination run wild! Here are even more ideas to inspire your next batch:

  • Chip Choices: Feel free to swap out the semi-sweet chocolate chips for other delightful varieties. Consider using creamy peanut butter chips for an extra nutty kick, rich dark chocolate chips for a more intense cocoa flavor, sweet white chocolate chips for a milder taste, or indulgent butterscotch chips for a unique caramel-like note. A combination of two or three different types of chips can also create a complex and exciting flavor profile.
  • Candy Creations: While mini M&M’s are fantastic, you can easily use regular-sized M&M’s for larger bursts of color and chocolate. For a different flavor, try Reese’s Pieces for a peanut butter candy explosion, or even chopped up leftover candy bars like Snickers, Heath bars, or Twix for an added layer of caramel, toffee, or biscuit crunch.
  • Nutty Additions: If peanuts aren’t your preference, or you simply want to try something new, swap them for other chopped nuts. Toasted pecans offer a buttery, earthy flavor, walnuts provide a slightly bitter contrast, while almonds bring a delicate sweetness. For an extra depth of flavor, lightly toast your chosen nuts before adding them to the dough.
  • Coconut & Cereal Ratio: For those who love tropical notes, reduce the amount of crispy rice cereal by half and introduce an equal amount of shredded coconut. This adds a lovely texture and a subtle, sweet coconut flavor that pairs wonderfully with chocolate and nuts.
  • Fruity Twists: For a chewy, slightly tangy element, consider adding dried cranberries, raisins, or chopped dried apricots. These fruits can provide a pleasant contrast to the sweetness of the cookie.
  • Pretzel Power: For an extra salty crunch, lightly crush some pretzels and fold them into the dough. The combination of sweet and salty is truly addictive!
  • Spice It Up: A pinch of cinnamon or nutmeg can add a warm, cozy dimension to your monster cookies, especially if you’re leaning towards more autumnal flavors.

The beauty of monster cookies is that they are incredibly forgiving and open to interpretation. Don’t be afraid to experiment with your favorite add-ins to create a personalized cookie masterpiece!

A freshly baked batch of extra-large monster cookies cooling on a parchment-lined baking sheet, showcasing their golden edges and rich mix-ins.

Expert Cookie Baking Tips for Perfect Results Every Time

Achieving cookie perfection requires attention to a few key details. Master these tips, and your monster cookies will turn out beautifully:

  • The Right Butter Temperature is Key: Always start with unsalted butter that has softened to true room temperature. This means it should be pliable enough for your finger to make a slight indent when pressed, but not so soft that it’s oily or at all melted. Butter that is too cold won’t cream properly with the sugars, leading to a denser cookie, while butter that is too warm can cause spreading. For quick tips, see my 4 ways to bring butter to room temperature.
  • Embrace Parchment Paper: These pre-cut parchment sheets are a baker’s best friend. Lining your sheet pans with parchment paper or a silicone baking mat ensures even baking, prevents sticking, and makes for incredibly easy, no-mess cleanup. It also helps regulate the cookie’s spread.
  • Shape Up Your Cookies: If your cookies bake up with slightly irregular edges, don’t fret! Immediately after removing them from the oven, while they are still warm and malleable, use a round cookie cutter (slightly larger than your cookies) or the back of a spoon to gently push the edges back into a perfectly round shape. This simple trick makes for beautifully uniform cookies.
  • To Chill or Not to Chill?: This particular monster cookie recipe is fantastic because it doesn’t strictly require chilling; you can bake them straight from the mixer for immediate gratification. However, if you desire cookies that are taller, thicker, and boast a deeper flavor, shaping the dough and chilling it on the sheet pan for 30 minutes before baking can work wonders. Both methods yield delicious results, so choose what suits your timeline!
  • Proper Storage for Freshness: Once completely cooled, store your monster cookies in an airtight container at room temperature. They will remain wonderfully fresh and chewy for several days, though we doubt they’ll last that long!
  • Plan Ahead with Frozen Dough: If you’re looking to prep ahead or prefer to bake only a portion of the dough at a time, freezing cookie dough is a brilliant solution. Check out my tips for how to store and freeze cookie dough for future baking sessions.

baking tip:How to Keep Your Monster Cookies from Spreading Too Much

It’s one of the most frustrating moments for any baker: you carefully place perfect balls of cookie dough into the oven, only to pull out flat, greasy, and sad-looking cookies. This common issue, where cookies spread excessively, can be caused by several factors. Understanding them can help you troubleshoot and achieve beautifully thick cookies:

  • The Temperature of Your Butter: This is arguably the most frequent culprit behind cookie spreading! If your recipe calls for room temperature butter, it’s crucial that it’s not too soft when you begin mixing your dough. When you gently press a finger into the butter, it should leave just a slight indent, not press all the way through or feel greasy. Overly soft butter melts too quickly in the oven, causing the cookie to spread before it has a chance to set.
  • Over-Creaming Butter and Sugar: While creaming butter and sugar together incorporates air, overbeating them can lead to problems. Excessive beating can break down the butter’s structure and incorporate too much air, which then collapses rapidly during baking, resulting in flatter, denser cookies. Cream until light and fluffy, but avoid going overboard.
  • A Greased Cookie Sheet: Surprisingly, greasing your cookie sheet can encourage spreading. The slick surface provides less friction for the cookie dough, allowing it to spread out more easily. Instead, always opt for parchment paper or a silicone baking mat. These provide a slightly textured surface that helps the cookie hold its shape as it bakes, preventing sticking without adding extra grease.

What if you’re already in the middle of baking a batch, and you notice your cookies are spreading too much? Don’t despair! A quick fix is to remove the spreading dough from the oven, shape it back, and then chill the cookie sheet with the dough for 10-15 minutes before returning it to the oven. This rapid cooling will firm up the butter, hopefully slowing down the spreading process and helping the cookies hold their shape better during the remainder of the bake.

More Baking Tips & Tricks »

A close-up shot of a single extra-large monster cookie, showcasing its thick, chewy texture and abundance of chocolate chips, M&Ms, peanuts, and oats.

How to Make Irresistible Extra-Large Monster Cookies: A Narrative Guide

Baking these monster cookies is a joyous and straightforward process, perfect for bakers of all skill levels. Let’s walk through the steps to ensure your cookies turn out perfectly chewy, crunchy, and packed with flavor.

  1. Preparation is Key: Begin by preheating your oven to 375°F (190°C). This ensures your oven is at the correct temperature for even baking from the start. Line your baking sheets with parchment paper or silicone baking mats – this is a crucial step for preventing sticking and ensuring easy cleanup.
  2. Creaming the Foundation: In the bowl of your stand mixer, fitted with the paddle attachment, combine your room-temperature unsalted butter with both the light or dark brown sugar and the granulated sugar. Beat these together on medium speed for about 1-2 minutes until the mixture is light, fluffy, and creamy. This creaming process incorporates air, which contributes to the cookie’s texture.
  3. Adding the Wet Ingredients: Next, crack in the large eggs, one at a time, mixing well after each addition until fully incorporated. Follow this with the vanilla extract, stirring until just combined. Be careful not to overmix at this stage.
  4. Introducing the Dry Ingredients: Reduce your mixer speed to low. Gradually add the all-purpose flour, salt, baking powder, and baking soda to the wet mixture. Mix only until the dry ingredients are just combined and no streaks of flour remain. Overmixing the flour can develop the gluten, leading to tougher cookies.
  5. The Monster Mix-In Party: Now for the fun part! Add your generous portions of old-fashioned rolled oats, mini M&M’s, semi-sweet chocolate chips, chopped peanuts, and crispy rice cereal to the dough. Mix on low speed, or even better, fold them in gently by hand with a spatula until they are just evenly distributed throughout the dough. You want to avoid crushing the cereal or overworking the dough.
  6. Scooping and Baking: Using a large cookie scoop (a #20 scoop, which holds about 3 tablespoons, is ideal for extra-large cookies), drop rounded portions of dough onto your prepared baking sheets. Space them out, allowing 6-8 cookies per pan, as they will spread.
  7. The Bake: Bake for approximately 12 minutes, or until the edges of the cookies are beautifully golden brown and the centers are just barely set. Remember that cookies continue to cook slightly after they are removed from the oven, so avoid overbaking.
  8. Cooling and Enjoying: Let the cookies cool on the baking sheet for about 5 minutes. This allows them to set and firm up before you transfer them to a wire rack to cool completely. Once cooled, they are ready to be devoured!

Following these steps will ensure you create a batch of monster cookies that are perfectly balanced in flavor and wonderfully satisfying in texture, cementing their place as a new favorite in your baking repertoire.

More Outrageous Cookie Recipes You’ll Love

If you’re a fan of unique and exciting cookie creations, here are a few more recipes that push the boundaries of deliciousness:

  • One Giant Peanut Butter Chocolate Chip Cookie: For when one cookie is all you need, but you want it to be spectacular.
  • Caramel-Stuffed Chocolate Chip Cookies: A delightful surprise of gooey caramel hidden inside a classic chocolate chip cookie.
  • Chocolate Marshmallow Cookies: A rich chocolate cookie topped with fluffy marshmallow and coated in chocolate – a true treat!

Watch the Video: See How These Monster Cookies Come to Life!

Shop Tools for this Recipe

These extra-large monster cookies are the ultimate cookie! They're packed with M&Ms, oats, chocolate chips, peanuts, and crispy rice cereal. 

5 from 3 reviews

Monster Cookies

Servings: 24 cookies
Prep Time: 15 minutes
Cook Time: 12 minutes
Total Time: 27 minutes
These are the cookies to bake when you aren’t sure what you’re craving. They’re packed with M&Ms, oats, butterscotch chips, pecans, and crispy rice cereal.
Print Recipe
Pin Recipe
Leave a Review

Ingredients

 

  • ¾ cup (85 grams) unsalted butter , at room temperature
  • 1 cup (215 grams) packed light or dark brown sugar
  • ½ cup (100 grams) granulated sugar
  • 2 large eggs
  • 1 tablespoon vanilla extract
  • 2 cups (240 grams) all-purpose flour
  • ½ teaspoons salt
  • 1 teaspoon baking powder
  • ½ teaspoon baking soda
  • 1 ½ cups (150 grams) rolled oats
  • ½ cup (108 grams) mini M&Ms
  • ¾ cup (128 grams) semisweet chocolate chips
  • ½ cup (70 grams) peanuts , chopped
  • 2 ¼ cups (70 grams) crispy rice cereal
Prevent your screen from going dark

Instructions

 

  • Preheat oven to 375°F. Line a sheet pan with parchment paper or a silicone baking mat.
  • In the bowl of a stand mixer fitted with a paddle attachment, beat together the butter and sugars until light and creamy, about 1-2 minutes. Add the eggs one at a time, followed by the vanilla and mix until combined.
  • Add the flour, salt, baking powder, and baking soda and mix on low until just combined. Add the oats, chips, and nuts, M&Ms, and crispy rice cereal and mix until just combined.
  • Drop large rounds (I use a #20 – 3 tablespoon cookie scoop) onto the prepared sheet pan, 6-8 per pan. Bake until edges are golden brown and centers are just barely set, about 12 minutes.
  • Let cool on the sheet for 5 minutes, then transfer to a wire rack to cool completely. Store in an airtight container for several days.

Video

Notes

Recipe adapted from The Pioneer Woman.
Calories: 244kcal, Carbohydrates: 33g, Protein: 4g, Fat: 11g, Saturated Fat: 6g, Cholesterol: 30mg, Sodium: 85mg, Potassium: 122mg, Fiber: 2g, Sugar: 18g, Vitamin A: 210IU, Calcium: 35mg, Iron: 1mg
Cuisine: American
Course: Dessert
Author: Annalise Sandberg
Have you tried this recipe?I’d love to hear about it! Leave a rating and review below, or take a photo and tag it on Instagram @completelydelicious with #completelydelicious.

Frequently Asked Questions (FAQs) About Monster Cookies

Got questions about these magnificent monster cookies? Here are some common queries and their answers to help you bake with confidence:

  • Can I use quick oats instead of rolled oats? While quick oats can be used in a pinch, old-fashioned rolled oats are highly recommended for monster cookies. Rolled oats provide a chewier texture and a more substantial bite, which is a hallmark of a great monster cookie. Quick oats tend to absorb more liquid and can result in a softer, less textured cookie.
  • Is it okay to substitute the M&M’s with other candies? Absolutely! Monster cookies are incredibly versatile. You can swap mini M&M’s for regular-sized M&M’s, Reese’s Pieces, chopped up candy bars (like Snickers or Butterfinger), or even seasonal candies. Just ensure the quantity remains roughly the same for the best results.
  • Can I make these cookies gluten-free? Yes, you can. To make these gluten-free, substitute the all-purpose flour with a 1:1 gluten-free baking flour blend that contains xanthan gum. Also, ensure your rolled oats are certified gluten-free, as oats can sometimes be cross-contaminated during processing.
  • How long do monster cookies stay fresh? When stored in an airtight container at room temperature, these monster cookies will remain fresh, chewy, and delicious for up to 3-5 days. For longer storage, you can freeze baked cookies for up to 2-3 months.
  • Do I have to chop the peanuts? While whole peanuts can be used, chopping them ensures a more even distribution throughout the cookie dough, meaning you get a bit of nutty crunch in every bite. If you prefer larger pieces, a rough chop is perfectly fine.
  • What if my cookie dough is too sticky or too dry? The consistency of cookie dough can sometimes be affected by humidity or minor measurement differences. If your dough is too sticky to handle, try adding a tablespoon or two of extra flour. If it seems too dry and crumbly, you can add a teaspoon of milk or water at a time until it reaches the desired consistency.

We hope these FAQs help you achieve monster cookie perfection! Don’t hesitate to experiment and make these cookies truly your own.