Prepare brownie mix according to package directions for fudge-like brownies. Stir in 1/2 cup chocolate chips and 1/4 cup peanuts. Spread into a greased 13x9 inch baking pan. Bake at 350 for 28-30 minutes or until a toothpick inserted near center comes out clean. Cool on wire rack.
Slice bananas; arrange in a single layer over brownies. Sprinkle 1/4 cup chocolate chips and 1/4 cup peanuts over bananas.
In a mixing bowl, beat the milk and pudding mixes on low speed for 2 minutes. Fold in whipped topping. Spread over the top. Sprinkle with remaining chips and peanuts. Refridgerate leftovers. 12-15 servings