Preheat oven to 325. Combine cake mix, melted butter, eggs, pudding mix, vegetable oil, mix thoroughly. Spray 9x13 pan with cooking spray with flour in it. Spread red velvet brownie layer into pan. Batter is very thick, use back of spoon to spread into pan. Bake 20-25 minutes or until cake tests done. Cool completely.
Crush package of Oreo cookies either in food processor or with a large plastic bag and a rolling pin. Melt cream cheese in microwave 1 minute and stir together crushed oreos and cream cheese until blended. Carefully spread onto cooled red velvet brownie layer, careful not to tear brownies.
Melt semi sweet chocolate chips and pour over top of Oreo layer spread carefully.
Take bag of mini chips and spread on top of melted layer, let cool completely before cutting.