These Peanut Butter Marshmallow Brownies are a triple-layered dessert made with a fudgy boxed brownie base, a gooey melted mini marshmallow middle, and a crispy chocolate-peanut butter topping. Chopped Reese’s Peanut Butter Cups add a rich candy layer, while crispy rice cereal in the topping delivers a crunchy contrast. Easy to make and crowd-pleasing, these brownies are perfect for bake sales, holidays, or indulgent weeknight desserts.
For the topping:
Use parchment paper for easy cleanup and smooth removal.
Let brownies cool completely before cutting for clean layers.
Don’t skip the crispy rice cereal topping—it’s what makes this dessert unique.
Store in the fridge for longer freshness and better structural integrity.
For a nut-free version, use sunflower seed butter and omit Reese’s.