These Monster Cookies are fun, delightful little treats that are packed full of flavor! Monster cookies are loaded with creamy peanut butter, chewy oats, melty chocolate chips and M&M’s. Grab a glass of milk and get ready to stuff your face with these incredible cookies.
Reasons You’ll Love This Recipe
Soft and Chewy – Thanks to the creamy peanut butter, these cookies have a wonderfully, chewy melt-in-your-mouth texture I know you’ll love!
Flavorful – Peanut butter, chocolate, vanilla, oh my! So many great flavors packed into one little cookie.
Easy Ingredients – These ingredients are ones you most likely already have in your pantry and refrigerator.
Peanut Butter Lovers – If you love peanut butter desserts, then you’ll love this simple Peanut Butter Monster Cookie recipe.
Leftover Halloween Candy – I know you have those little bags of M&Ms piling up from your kid’s Halloween candy stash… They won’t notice if just a few of them go missing to make these delicious cookies.
Seriously, these cookies have so much goodness in every single bite! Gorgeously lumpy, chewy and colorful Peanut Butter Monster Cookies are the type of treat to make you do a little dance in your seat when you take a bite.
Ingredients and Substitutions
Recipe Discussion
Let’s discuss how to make this recipe, as well as the ingredients that are needed. Please take note that below you will find discussion, expert tips, and answers to frequently asked questions about this recipe to help you recreate it in your kitchen. If you *just* want the recipe itself, scroll down. The full printable recipe itself, with exact measurements and instructions, is found at the bottom of this page.
- Flour – This recipe calls for all-purpose flour. Note that these monster cookies contain significantly less flour than the typical cookie recipe, so when these cookies are cooling, don’t try to sneak a bite before they’re fully set otherwise they’ll crumble apart in your hand.
- M&Ms – You can use regular M&Ms, or any different flavor/color of M&Ms you prefer. These are totally customizable that way!
- Chocolate Chips – This recipe calls for semi-sweet chocolate chips, but you can use dark chocolate, milk chocolate, or even white chocolate if you prefer!
- Butter – Make sure the butter is softened.
- Rolled Oats – Rolled oats have the best consistency for this recipe, I don’t recommend substituting a different kind.
- Peanut Butter – I don’t recommend using ‘natural’ peanut butter for this recipe, because it will mess up the consistency of the cookie. Use the typical, “Jif” style peanut butter.
How To Make Monster Cookies
- Start by preheating your oven to 350°. In a large mixing bowl, add the butter and sugar and beat together with an electric mixer for about 4 minutes or until creamy and pale.
- Pour in the vanilla extract and continue to beat together, then add the egg and combine til smooth. Lastly, add the peanut butter, beat together until combined and set this mixture to the side.
- In a separate bowl, sift the flour, baking soda, cornstarch and gently whisk together until combined. Then add the dry mixture to the wet ingredients by gently folding it together with a spatula.
- Add in the chocolate chips and M&Ms and fold that together gently until combined.
- Cover the bowl with plastic wrap and refrigerate for at least one hour.
- Line two baking trays with parchment paper. Take the cookie dough out of the fridge and begin rolling it into 1 tablespoon sized balls. The dough will still be sticky, but should be firm enough to hold their shape. Line the cookie dough evenly onto the baking trays, and press down on each cookie with your hand or a spatula because these cookies don’t spread out in the oven much. Press a few more M&Ms and chocolate chips into the tops of the cookies and bake for 12 minutes or until the edges are golden brown. Allow them to cool slightly before moving them to a wire rack to cool completely before serving.
Recipe Tips and Advice
Storage – Store these covered in an airtight container at room temperature for about 3 days, or in the freezer for 3 months.
Equipment – For this recipe, you’ll need a few mixing bowls, an electric hand or stand mixer, a spatula, a few baking trays, and some parchment paper.
Recipe FAQs
This could be for a number of reasons. Your butter may have been too soft or melted, so make sure the butter is soft, but still solid. This could also be because you used a “natural” peanut butter and the oils from the peanut butter cause it to spread way too much.
Yes! You can roll the dough into balls and freeze them for up to three months. When you’re ready to bake, you can pop them in the oven frozen, just add a few extra minutes to the baking time.
More Delicious Cookie Recipes
If you enjoyed these peanut butter monster cookies, try out a few more of these amazing, similar recipes!
- Chocolate Peanut Butter Cookies
- Oatmeal Chocolate Chip Cookies
- Vanishing Oatmeal Cookies
- Chewy Oatmeal Cookies
- Improved Nestle Toll House Cookies
- Double Chocolate Chip Cookies
- Chocolate M&M Cookies
- The Best Peanut Butter Cookies
- Chocolate Chip Peanut Butter Cookies
Tried this recipe?
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Monster Cookie Recipe
Ingredients
- 1/2 cup butter softened
- 3/4 cup light brown sugar firmly packed (dark also works)
- 1 tsp vanilla extract
- 1 large egg
- 3/4 cups creamy peanut butter
- 1/2 cup all-purpose flour
- 1/2 tsp baking soda
- 1 tsp cornstarch
- 1 cup rolled oats
- 1/2 cup plain M&Ms
- 1/2 cup semi-sweet chocolate chips
Instructions
- In a large mixing bowl, cream the butter and sugar for about 4 minutes or until creamy and pale. Add the vanilla and beat again. Then add the egg and beat until smooth. Add the peanut butter and beat until combined.
- In a separate bowl, sift the flour, baking soda, cornstarch and gently whisk together. Then add the dry ingredients to the wet and gently fold together. Add the rolled oats, M&M's and chocolate chips and stir until combined.
- Cover the bowl with plastic wrap and refrigerate for at least one hour.
- Line two oven trays with baking paper. Preheat the oven to 350 F.
- Grab cookie dough from the fridge. The dough will still be a bit sticky but it should be firm enough to roll balls using your hands.
- Line the balls (approximately 1 heaped tablespoon) of cookie dough onto the prepared trays and then flatten slightly using your hand or a spatula, as they wont spread out as much as a normal cookie would. Press a few extra M&M’s and chocolate chips on top if desired.
- Bake the cookies for approximately 12 minutes or until golden brown on the edges. Leave the cookies to cool slightly before gently moving to a wire rack to cool completely.
Notes
Nutrition
Disclaimer
Nutrition information is estimated as a courtesy. If using for medical purposes, please verify information using your own nutritional calculator. Percent Daily Values are based on a 2000 calorie diet.
Melissa says
Oh dear! What am I supposed to do? How am I ever supposed to stop eating sugar when I know people like you? I seriously almost made your chocolate bundt cake today. Luckily, I do not have any cream for the ganache (but I did buy sour cream!) Now I might have to run to the store and get some M&Ms to make these cookies!