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close up of Marshmallow Peanut Butter Crunch Brownie bar

Marshmallow Peanut Butter Crunch Brownies

Fudgy, dark chocolate brownies topped with marshmallow fluff and then a peanut butter chocolate crunch top!

Course Dessert, Snack


  • 1 (20-ounce) box of brownies (9x13 pan size), plus ingredients listed on box (I like to use Betty Crocker's Dark Chocolate mix for this)
  • 2 cups marshmallow fluff
  • 2 cups chocolate chips (can be semi-sweet or milk chocolate)
  • 1 cup creamy peanut butter
  • 4 cups rice krispies cereal


  1. Make brownies, following directions on box, using a 9x13 pan. (Make sure you don't over-bake your brownies, I like to take mine out about 3 minutes earlier than the suggested time!). Let cool.

  2. Spread cooled brownies with 2 cups of marshmallow fluff. (For easier spreading, heat fluff briefly in microwave, 20-30 seconds, to soften it).

  3. Add the 2 cups of chocolate chips and 1 cup of peanut butter to a medium, microwave safe bowl. Heat in microwave one minute. Stir. Heat an additional 30 seconds, or until the chocolate chips are just starting to melt. Stir until smooth.

  4. Add the 4 cups of rice krispies and stir to evenly coat the cereal.

  5. Pour the rice krispies mixture on top of the fluff and spread to evenly cover.

  6. Refrigerate until set. Or if you're impatient like me, freeze till set.

  7. Cut into bars & enjoy!

  8. Store in airtight container (refrigerator is best, as the marshmallow can start to ooze and the chocolate will start to melt).