For best success when whipping cream, chill the beater and the bowl ahead of time. Did you forget? Fill the bowl with ice water and place the beaters in it. Swirl it around for a few seconds, drain, and dry the bowl. You can design this cake any size you want. Just cut the circle guides to fit your serving plate. If you prefer, you can assemble this icebox cake in loaf pans lined with plastic wrap. When ready to serve, turn them out onto a platter and cover with whipped cream.