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Start with Batter for a 2-Layer Cake - Step 1
Evenly divided the batter between the 2 pans.
Photo (c) by Carroll Pellegrinelli, licensed to About.com, Inc.
Instead of baking the batter in 2- 8 or 9-inch round pans, divide the batter between one 8-inch round pan and one 8-inch square pan. Use a serrated knife to cut round cake in half.