Better than Crack Brownies

1 batch brownies (box mix)
1/2 c salted peanuts
1 c chopped Reese's peanut butter cups
1 1/2 c milk chocolate chips
1 1/2 c creamy peanut butter
1/2 T butter
1 1/2 c Rice Krispies cereal

Mix brownies according to directions and bake for 20-25 minutes in 9 x 13 baking dish.  Remove and top with peanuts and peanut butter cups.  Bake for 4-6 minutes more. 
While they are baking, melt chocolate chips, peanut butter and butter.  Stir in cereal.  Remove brownies from oven and evenly pour chocolate mixture over tip.  Refrigerate for 2 hours before serving.