Monster Cookies

Name: Monster Cookies
Prep time: 15 min
Cook time: 12 min
Total time: 27 min
Yield: 18
Cuisine: American
Ingredients: 1 cup rolled oats; 1 cup plain all purpose flour; 1/2 teaspoon baking soda; 1/4 teaspoon salt; 1/2 cup unsalted butter, melted; 3/4 cup commercial peanut butter; 1 cup brown sugar; 1 large egg, fridge cold; 1 teaspoon vanilla extract; 1 cup plain M&Ms; 1/2 cup semi sweet chocolate chips

These fun and chewy cookies are a delicious mash up of peanut butter, oatmeal, and chocolate chip flavors.

By Recipes By Nani· 🌍 American· September 18, 2026

recipesbynani.com

Prep

15 minutes

Cook

12 minutes

Total

27 minutes

Serves

These cookies are known for being monstrously loaded with treats. They have crispy edges, a chewy center, and are absolutely packed with chocolate chips and colorful M&Ms. Whether you call them monster cookies because of the variety of ingredients or because they are wonderfully messy, they are sure to be a hit with everyone who tries them.

I love this recipe because it is a simple, hand mixed dough that you do not need to chill before baking. If you want to make them look extra special, save a few extra M&Ms to press onto the tops of the cookies as soon as they come out of the oven.

🧺 Ingredients

1 cup rolled oats
1 cup plain all purpose flour
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 cup unsalted butter, melted
3/4 cup commercial peanut butter
1 cup brown sugar
1 large egg, fridge cold
1 teaspoon vanilla extract
1 cup plain M&Ms
1/2 cup semi sweet chocolate chips

👩‍🍳Instructions

1
Preheat your oven to 350 degrees F and line a large baking sheet with parchment paper.
2
In a medium bowl, stir together the flour, rolled oats, baking soda, and salt. Set this aside.
3
In a large bowl, melt the butter until mostly liquid but with a few small lumps remaining. Stir until the heat of the liquid butter melts the rest.
4
Add the peanut butter, brown sugar, egg, and vanilla to the melted butter. Mix well with a wooden spoon until combined.
5
Pour the dry ingredients into the wet ingredients and mix until just combined. Fold in most of the M&Ms and chocolate chips, reserving a small handful for the tops.
6
Scoop rounded tablespoons of dough onto your prepared baking sheet, spacing them out to allow for spreading.
7
Bake for 10 to 12 minutes until the edges are golden brown. Press the remaining M&Ms into the tops of the hot cookies immediately after taking them out of the oven.
8
Let the cookies cool on the baking sheet for 5 minutes before moving them to a wire rack to cool completely.

💡 Tips

Store these cookies in an airtight container at room temperature for up to 5 days. You can also freeze the baked cookies for a quick treat later on, or keep the raw dough balls in the freezer to bake whenever you have a craving.

#cookies #dessert #baking #easy #homemade

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