• Spoon half of the batter into medium bowl. Into batter remaining in large bowl, with a rubber spatula, stir in melted chocolates and remaining 1 tablespoon milk.
Spoon vanilla batter into 1 large decorating bag with a 1/2-inch opening. Repeat with chocolate batter and a second large decorating bag with a 1/2-inch opening.
• Pipe a 1 1/2-inch-wide band of chocolate batter around inside edge of 2 prepared cake pans, then pipe a 1 1/2-inch-wide band of vanilla batter next to each chocolate band.
Pipe enough chocolate batter to fill in the center of each pan. In the third pan, repeat piping, alternating rings of batter, but start with vanilla batter around inside edge of the pan.
• Stagger cake pans on 2 oven racks, placing 2 on the upper rack and 1 on the lower rack so that pans are not directly above one another.
Bake 20 minutes, or until a toothpick inserted in center of layers comes out almost clean. Cool in pans on wire racks 10 minutes.
• With a small knife, loosen layers from sides of pans; invert onto wire racks. Remove waxed paper; cool completely.
• Meanwhile, have ready the chocolate frosting of your choice. Place 1 of the 2 identical cake layers on cake plate; spread with 1/2 cup frosting. Top with the reverse-design cake layer.
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