Vanilla Cake with Tiramisu Buttercream and Bittersweet Ganache Filling
"Makes one three-layer 9-inch round cake, or a three-layer 8-inch round cake and 6 cupcakes. Cake recipe adapted from Sky High: Irresistible Triple-Layer Cakes. Buttercream adapted from Martha Stewart...."
INGREDIENTS
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Cake: 3 3/4 cups cake flour 2 1/2 cups sugar 1 tablespoon plus 2 3/4 teaspoons baking powder 1/2 teaspoon salt 2 1/2 sticks (10 ounces) unsalted butter, at room temperature 1 1/4 cups plus 1/3 cup buttermilk 5 whole eggs 2 egg yolks 2 1/2 teaspoons v