Mix cake mix, 3/4 cup frosting, 3/4 cup water and 1/4 cup oil. Beat 2 minutes on high speed. Grease bottom and sides on 2 9 â€œ pie or cake pans. Spread half of the batter in each pan, do not spread up sides. Bake at 350 degrees for 25-30 minutes. Cake will collapse in the middle to form a shell. Cool completely. Soften ice cream until it is spreadable. Spread ice cream in center of each shell leaving Â½â€ rim. Heat remaining frosting for 15 seconds. Drop frosting by spoonfuls on top of ice cream. Swirl with knife. Freeze at least 2 hours. Store in air tight freezer wrap.