On a cake stand, place one of the thin 9-inch brownies. Spread some of the mint chip ice cream on top of the brownie and add a 9-inch cookie on top. Gently press down on the cookie so the ice cream is evenly spread between the layers. Transfer cake into the freezer and freeze for 30 minutes. Once re-frozen spread a layer of Chocolate Fudge Ice Cream followed by a brownie. Freeze. Add another layer of Mint Chip Ice Cream followed by a cookie. Freeze. Add a layer of Chocolate Fudge Ice Cream followed by a brownie. Freeze. Remove from freezer and quickly frost with cream cheese frosting. Place back into freezer until ready to serve.