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Monster Cookie Brownies - stuffed with peanut butter chips and M&Ms, and covered in peanut butter oatmeal cookie dough frosting #peanutbutter #monstercookies #brownies | www.thebatterthickens.com

Monster Cookie Brownies

  • Author: Molly
  • Prep Time: 20 minutes
  • Cook Time: 30 minutes
  • Total Time: 1 1/2 hours
  • Yield: 12-16 brownies 1x

Ingredients

Monster Cookie Brownies

  • 1 box brownie mix
  • 1/2 cup M&M’s
  • 1/2 cup peanut butter chips

Peanut Butter Oatmeal Cookie Dough Frosting

  • 1 stick unsalted butter, softened
  • 2/3 cup peanut butter
  • 1/3 cup brown sugar
  • 1/3 cup oat flour**
  • 1/2 teaspoon salt
  • 2 teaspoons vanilla extract
  • 2 cups powdered sugar
  • 4 tbsp heavy whipping cream

Instructions

Make the brownies:

  1. Mix brownies batter according to box instructions.
  2. Fold in M&M’s and peanut butter chips.
  3. Bake according to box instructions.

Make the frosting:

  1. In a large bowl, beat together the butter, peanut butter, and brown sugar until creamy and fluffy, about 2-3 minutes.
  2. Beat in the oat flour, salt, and vanilla. Gradually beat in the powdered sugar.
  3. Beat in the heavy cream and beat another 1-2 minutes or until the frosting is fluffy.

Notes

**You can make oat flour by putting 1/3 cup quick oats in your food processor and processing until it becomes a fine powder.