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Monster cookies on a plate.

Monster Cookies

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5 from 1 review

  • Author: Sandra Flegg
  • Total Time: 20 minutes
  • Yield: 26 cookies


This soft Monster Cookies recipe is one of the most popular and delcious colorful cookie that you have ever tasted!! The combination of the oats, M&M’s, chocolate chips and the salty sweet peanut butter makes a perfectly balanced cookie of texture and flavor goodness!!


1 cup all-purpose flour

1 cup old fashioned oats

1 teaspoon baking soda

1/4 teaspoon salt

1/2 cup unsalted butter, room temperature

1/2 cup cream peanut butter

3/4 cup brown sugar, lightly packed

1/4 cup granulated sugar

1 large egg, room temperature

2 teaspoons vanilla extract

1 cup M&Ms

3/4 cup semi-sweet chocolate chips


Preheat the oven to 350 degrees F. Line three large cookie sheets with parchment paper and set aside.

Mix the flour, oats, baking soda, and salt in a medium bowl.

In a large bowl, cream the butter, peanut butter, and sugar with a hand or stand mixer until smooth and creamy.   

Add the egg and vanilla and beat until well combined.

Add the dry ingredients to the wet and mix until just combined.

Fold in the M&Ms and chocolate chips.

Scoop the dough onto the prepared cookie sheets using a medium cookie scoop, leaving at least two inches between each ball.

Bake for 10-12 minutes or until the edges of the cookie are set.

Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to finish cooling.


Storage instructions:

Store leftovers in an airtight container at room temperature for up to 5 days.

The baked cookies can be frozen for up to 3 months in a freezer-safe container or freeze bags once properly cooled. Thaw at room temperature before enjoying them.

The cookie dough can be frozen be frozen for up to 3 months. Flash freeze the scooped dough balls on a parchment lined baking sheet until frozen solid. Transfer to a freezer bag or freezer-safe container to freeze.

The frozen monster dough balls can be baked from frozen by adding 2 to 3 minutes of baking time. Perfect to make monster cookies ahead of time!!

  • Prep Time: 10 minutes
  • Cook Time: 10 minutes
  • Category: Cookies
  • Method: Oven Baked
  • Cuisine: American