Name: Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe
Prep time: 10 min
Cook time: 42 min
Total time: 52 min
Cuisine: American
Ingredients: 2½ cups old fashioned rolled oats; 1 cup unbleached all-purpose flour; ½ cup whole wheat flour; 2 teaspoons baking soda; ½ teaspoon fine salt (sea salt or pink Himalayan); 1 cup unsalted butter, softened to room temperature; 1 cup crunchy peanut butter; ¾ cup dark brown sugar; ¾ cup granulated sugar; 2 large eggs; 1 teaspoon vanilla extract; 1 cup milk chocolate chips; 1½ cups M&M candies

↓ Jump to Recipe

If you’re dreaming of a cookie that truly lives up to its name, you simply have to try my *Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe*. It’s the perfect marriage of chewy oats, rich peanut butter, melty chocolate chips, and colorful M&Ms, all packed into one irresistible, giant cookie. Every bite delivers a delightful crunch and ooey-gooey sweetness that’s hard to beat, making these cookies a guaranteed crowd-pleaser for any occasion.

Ingredients You'll Need

The image shows a collection of baking ingredients neatly placed on a white marbled surface. There are eleven items arranged mostly in a scattered way: on the left, a small wooden dish holds white salt, next to a medium clear glass bowl filled with white flour above a smaller clear bowl with light brown flour; a tiny clear bowl contains white baking soda. At the center, a jar of creamy peanut butter sits above two sticks of unsalted butter in white paper wrapping, with two brown eggs beside them. On the right side, a small glass bowl holds brown sugar, a white bowl is full of colorful M&M candies, and another white bowl contains dark chocolate chips. At the bottom left, a medium clear bowl is filled with white granulated sugar. The colors range from the white powders to the brown and yellow tones of peanut butter, butter, and sugar, plus the vivid multicolor of the candies. The photo taken with an iphone --ar 4:5 --v 7

The magic behind this Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe lies in its straightforward ingredients, each chosen to give the cookies their perfect texture, taste, and vibrant look. Let’s take a look at what you’ll need to get started:

Old fashioned rolled oats (2½ cups): These add that wonderfully chewy texture and wholesome flavor that makes each bite feel hearty.

Unbleached all-purpose flour (1 cup): Provides structure so your cookies hold their shape without being tough.
Whole wheat flour (½ cup): Adds a subtle nuttiness and boosts the cookie’s wholesome appeal.
Baking soda (2 teaspoons): Helps the cookies rise just right and get that perfect golden edge.

Fine salt (½ teaspoon): Balances sweetness and brightens all the cookie flavors.
Unsalted butter, softened (1 cup): Gives richness and a tender crumb, plus helps those flavors meld beautifully.
Crunchy peanut butter (1 cup): Brings deep nutty flavor and an extra crunch that makes these cookies unmistakable.

Dark brown sugar (¾ cup): Adds moisture and caramel undertones for that perfect chewy bite.
Granulated sugar (¾ cup): Ensures the cookie has just the right crisp edge and sweetness.
Large eggs (2): Bind everything together while adding a nice richness.

Vanilla extract (1 teaspoon): Elevates all the flavors with its warm sweetness.
Milk chocolate chips (1 cup): Melts into pockets of gooey goodness that complement every bite.
M&M candies (1½ cups): The colorful bursts of candy add fun, texture, and extra chocolate flavor.

How to Make Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe

Step 1: Preheat and Prepare

First things first, preheat your oven to 350℉ (180℃). Line rimmed metal baking sheets with parchment paper or silicone baking mats to keep your cookies cooking evenly and prevent any sticking. This simple prep sets the stage for perfect baking.

Step 2: Mix Dry Ingredients

In a large bowl, whisk together the old fashioned oats, unbleached all-purpose flour, whole wheat flour, baking soda, and salt. These dry ingredients blend to give your cookie its signature hearty texture and balanced rise.

Step 3: Cream Butter, Peanut Butter, and Sugars

Using a stand mixer fitted with a paddle attachment, beat the softened butter, crunchy peanut butter, dark brown sugar, and granulated sugar together until the mixture is light and creamy. This step is crucial — it incorporates air to make your cookies nice and tender.

Step 4: Add Eggs and Vanilla

Add the eggs one at a time to the creamed mixture, beating well after each addition. Toss in the vanilla extract with the final egg to infuse that irresistible warm aroma throughout the dough.

Step 5: Combine Wet and Dry Ingredients

Gradually add half of the oat and flour mixture to the wet ingredients, mixing just until combined. Then add the remaining half and mix again until the dough comes together but stays soft and scoopable.

Step 6: Fold in Chocolate Chips and M&Ms

Stir in the milk chocolate chips to distribute that luscious melted chocolate throughout your dough. Then, gently fold in the M&M candies by hand using a spatula—this keeps them intact and adds those delightful bursts of color and crunch.

Step 7: Scoop and Bake

Use a 3-tablespoon cookie scoop to portion the dough, placing 10 scoops spaced a few inches apart on each baking sheet. Pop the trays in your preheated oven on the middle rack, and bake for 12 to 14 minutes, rotating halfway through for even baking. Once the edges are golden and the centers have set, transfer the cookies to a wire rack to cool.

How to Serve Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe

The image shows three cookies on a metal cooling rack placed on a white marbled surface. Each cookie has a golden brown color with a rough, crumbly texture and is filled with colorful candy pieces and chocolate chips. The candies are round and shiny in red, blue, green, yellow, and orange, embedded unevenly across the top of the cookies. The chocolate chips are dark brown, round, and slightly melting into the cookies. In the background to the right, there is a white plate with similar cookies, and a gray and white striped cloth with some candy pieces scattered on the white marbled surface. The light is soft and natural. photo taken with an iphone --ar 4:5 --v 7

Garnishes

These cookies speak for themselves, but if you want to dress them up a bit, sprinkle a few extra M&Ms or chocolate chips on top while the dough is still soft right before baking. A light dusting of flaky sea salt after baking can also balance the sweetness beautifully.

Side Dishes

Pair these Monster Cookies with a cold glass of milk, creamy vanilla ice cream, or a cup of hot coffee or tea. The rich peanut butter and chocolate flavors are enhanced by refreshing or warm beverages, turning snack time into a cozy indulgence.

Creative Ways to Present

Serve stacked cookies tied with rustic twine for a charming gift, or arrange them on a colorful platter with some fresh fruit for a vibrant party spread. You can also create a cookie sandwich by cutting the cookies in half horizontally and filling with a scoop of peanut butter or cream cheese frosting for an extra-special treat.

Make Ahead and Storage

Storing Leftovers

Keep your Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe fresh by storing them in an airtight container at room temperature. They’ll stay soft and delicious for up to a week — perfect for enjoying a little cookie magic any time you want.

Freezing

To freeze, place cooled cookies in a single layer on a baking sheet and freeze until firm. Then transfer them to a freezer-safe bag or container. They’ll keep beautifully for 2 to 3 months and thaw quickly when you want a tasty treat.

Reheating

Warm your cookies in a microwave for about 10 to 15 seconds or in a preheated oven at 300℉ for 5 minutes to revive that fresh-baked softness and melty goodness — almost like they just came out of the oven.

FAQs

Can I use creamy peanut butter instead of crunchy?

Absolutely! Using creamy peanut butter will give you a smoother texture, but you’ll miss out on those satisfying nutty bits. Both options taste fantastic, so go with your preference.

Are Monster Cookies gluten-free with this recipe?

This recipe includes all-purpose and whole wheat flour, so it is not gluten-free. However, you can try substituting with a gluten-free flour blend designed for baking to make a similar version.

Can I substitute the M&Ms with another candy?

Yes, feel free to switch out M&Ms for other mini candies like Reese’s Pieces, chopped nuts, or even dried fruit chunks. It’s your cookie adventure, so customize it to your taste!

How can I tell when the cookies are done baking?

Look for golden edges and slightly set centers. The cookies will continue to firm up as they cool, so don’t overbake or they risk becoming hard.

Is it okay to use salted butter?

While the recipe calls for unsalted butter to control salt content, using salted butter will still work. Just reduce or omit the added salt to avoid over-seasoning.

Final Thoughts

There’s something truly magical about making these Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe — from mixing up the rich, chunky dough to biting into the perfect meld of chewy, crunchy, and chocolatey layers. I hope you give this recipe a try and find yourself reaching for seconds just as I do. Happy baking, friend!

Monster Cookies with Oats, Peanut Butter, Chocolate Chips, and M&Ms Recipe

Ingredients You'll Need