Divide the batter evenly between the prepared cake pans and smooth the tops. Bake for about 25-30 minutes, or until a toothpick inserted into the center comes out clean. As the cakes cool, work on the seven-minute frosting. In a heatproof bowl, combine the egg whites, sugar, and water. Place the bowl over a pot of simmering water, whipping continuously until the mixture forms stiff peaks. Remove from the heat and stir in the vanilla extract. Once the cakes are cooled, frost them with the seven-minute frosting. Slice, serve, and enjoy your delightful creation!