Preheat oven to 350 degrees. Lightly butter a 13x9 pan.
In large bol, combine cake mix, 1 egg, and 8 T. (1/2 cup) melted butter, and stir until well blended. Pat mixture into prepared pan and set aside.
In stand mixer or with hand mixer, beat cream cheese until smooth. Add the remaining 2 eggs and cocoa powder. Lower the speed of the mixer, and add the powdered sugar. Continue beating until ingredients are well mixed. Slowly add the remaining 8 T. (1/2 cup) of melted butter and vanilla. Continue to beat the mixture until smooth. Stir in nuts with a rubber spatula. Spread filling over cake mixture in pan.
Bake for 40-50 minutes. Be careful not to over cook the cake; the center should still be a little gooey when finished baking.
Let cake cool completely before cutting into pieces.
Place scoops of ice cream interchangeably with brownie bites, cookie crumbs, nuts, and fudge. Mix together. (I didn't mix but just scooped out!) :D.