One box brownie mix plus ingredients listed on box (oil, eggs) or your favorite brownie recipe
1 1/3 cups semi-sweet chocolate chips
1 cup peanut butter
3 tablespoons butter
2 cups Rice Krispies
Line 9 x 13 inch pan with greased foil or parchment. Preheat oven for brownies. Make brownies per recipe or package. Bake till almost done...about 2 minutes less than time called for.
Remove from oven and sprinkle with marshmallows. Return to oven for 2 minutes. Remove to cooling rack, and cool completely.
In microwave safe bowl, heat chocolate chips, peanut butter and butter for 30 seconds. Stir and repeat till chocolate is melted and mixture in smooth. Add cereal and fold in gently till cereal is coated. Drop mixture on top of marshmallows. Carefully spread to coat top of bars evenly.
Cool in fridge for a few hours. Remove from pan using parchment. Score and cut.