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If you have a serious sweet tooth and love a cookie loaded with personality, this Monster Cookies Recipe is your new best friend. Imagine chewy peanut butter goodness packed with hearty oats and bursting with colorful M&M’s and melty chocolate chips in every bite. These cookies are joyfully unpretentious but absolutely crave-worthy, making them perfect for a quick snack, a crowd-pleasing treat at parties, or just a delicious way to brighten your day. Every bite feels like a celebration of classic flavors with a fun twist that’ll have you reaching for one after another.

Ingredients You’ll Need
Don’t let the length of this list scare you—each ingredient is simple, familiar, and plays a crucial role in creating the perfect balance of taste, texture, and color that makes Monster Cookies so irresistible.
- 1 cup creamy peanut butter: The rich base that brings a smooth, nutty flavor and chewy texture.
- 1/2 cup unsalted butter (softened): Adds tenderness and a buttery depth to every bite.
- 1 cup brown sugar (packed): Brings moisture and a caramel-like sweetness that complements the peanut butter.
- 1/2 cup granulated sugar: Balances sweetness and helps create a slight crisp edge on the cookies.
- 2 large eggs: Bind everything together and give structure to the dough.
- 1 teaspoon vanilla extract: Enhances flavor with a warm, aromatic note.
- 1 1/2 teaspoons baking soda: Provides the perfect rise and helps with lightness.
- 1/2 teaspoon salt: Elevates the sweetness while balancing flavors.
- 2 cups old-fashioned oats: Contribute heartiness and a pleasing chewiness.
- 1 cup all-purpose flour: The foundation for cookie structure and tenderness.
- 3/4 cup chocolate chips: Melt into luscious pockets of chocolate throughout.
- 3/4 cup M&M’s: For that iconic colorful crunch and fun surprise.
- 1/2 cup mini chocolate chips (optional): Add extra chocolate bursts and texture variety.
How to Make Monster Cookies Recipe
Step 1: Cream the Butters and Sugars
Start by preheating your oven to 350°F (175°C) and lining your baking sheets with parchment paper—that way, cleanup will be a breeze. In a large bowl, beat together the creamy peanut butter, softened butter, brown sugar, and granulated sugar until the mixture is smooth and creamy. This step is key for creating the perfect cookie texture, as beating incorporates air and melts the sugars just right.
Step 2: Add the Eggs and Vanilla
Mix in the eggs one at a time along with the vanilla extract until everything is fully combined. This enriches the dough and infuses it with that inviting warmth and sweetness that makes these cookies so comforting.
Step 3: Stir in Baking Soda and Salt
Next, add the baking soda and salt. These small but powerful ingredients help your cookies set to the perfect consistency and balance out the sweetness for a more complex flavor.
Step 4: Mix in Oats and Flour
Gradually fold in the old-fashioned oats and all-purpose flour. These give your cookies a wonderfully chewy texture and the perfect amount of body—no crumbly cookies here!
Step 5: Fold in the Chocolate Chips and M&M’s
Now for the fun part—gently fold in your chocolate chips, M&M’s, and, if you’re using them, mini chocolate chips. These add bursts of chocolate and that playful pop of color that gives Monster Cookies their signature look and taste.
Step 6: Scoop and Bake
Use a 2-tablespoon scoop to portion out your dough onto the lined baking sheets, spacing them about 2 inches apart so they have room to spread. Bake for 10 to 12 minutes or until the edges are lightly golden and the centers look just set—slightly underbaking ensures your cookies stay soft and chewy. Let them cool on the sheets for 5 minutes before transferring to a wire rack to finish cooling.
How to Serve Monster Cookies Recipe

Garnishes
While these cookies are stunning as they are, you can add a sprinkle of flaky sea salt on top right when they come out of the oven for a delightful salty-sweet balance. Alternatively, drizzle a bit of melted peanut butter or chocolate over the top for an extra indulgent touch.
Side Dishes
Monster cookies pair beautifully with a cold glass of milk for classic comfort, or try them alongside a scoop of vanilla ice cream for an easy dessert that feels festive and special. A cup of coffee or hot cocoa also elevates these cookies perfectly for a cozy afternoon treat.
Creative Ways to Present
For parties or gift-giving, stack Monster Cookies Recipe servings on a cute platter tied with a colorful ribbon. You can also sandwich two cookies with a dollop of peanut butter or frosting in between for a playful cookie sandwich. Another lovely idea is to dip half the cookie in melted chocolate and let it harden for a stunning contrast in flavor and texture.
Make Ahead and Storage
Storing Leftovers
To keep your Monster Cookies fresh and chewy, store them in an airtight container at room temperature. They’ll stay delicious for up to 5 days—just make sure to keep them away from direct sunlight or heat, which can dry them out.
Freezing
You can freeze these cookies, either baked or as dough balls, for future enjoyment. Wrap them tightly in plastic wrap or place in freezer bags, separating layers with parchment paper. Frozen baked cookies can last up to 3 months, while dough balls should be baked within 2 months of freezing.
Reheating
If you want to enjoy the cookies warm, simply pop a cookie in the microwave for 10 to 15 seconds or warm in a low oven (around 300°F) for a few minutes. This helps soften the cookies back up and brings out that melty chocolate goodness just like fresh from the oven.
FAQs
What makes these cookies “monster” cookies?
The term “monster” comes from the cookie’s hearty size and the fun, chunky mix-ins like oats, peanut butter, M&M’s, and chocolate chips that make each cookie a big, flavorful explosion. They are stuffed with everything you want in a cookie, creating a “monster” of deliciousness.
Can I substitute crunchy peanut butter for creamy?
Yes, you can use crunchy peanut butter if you want extra texture in your Monster Cookies Recipe. It will add a nice bit of crunch inside the chewy cookie, though creamy generally yields the most uniformly soft results.
Are these cookies gluten-free?
This recipe uses all-purpose flour and old-fashioned oats, which typically contain gluten. To make it gluten-free, substitute the flour for a gluten-free blend and use certified gluten-free oats.
Can I add nuts or other mix-ins?
Absolutely! Feel free to customize this Monster Cookies Recipe with chopped nuts, butterscotch chips, or peanut butter chips for extra flair. Just keep the total mix-in volume about the same to maintain cookie structure.
How do I keep my Monster Cookies soft?
To keep your Monster Cookies soft, slightly underbake them, pulling them out when their edges are golden and centers just set. Also, store them in an airtight container once cooled. Adding a slice of bread in the container can help maintain moisture.
Final Thoughts
There is just something incredibly comforting about these lively, chewy, and flavorful cookies that makes them a kitchen favorite. This Monster Cookies Recipe mixes classic flavors with a playful twist that’s sure to brighten your day and satisfy any cookie craving. Trust me, once you try these, you’ll keep coming back to this recipe for every occasion—grab your ingredients and start baking, because these cookies were made to be shared and enjoyed instantly!
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