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