"This recipe makes enough for three 8-inch round layers OR two 9-inch layers + 6 cupcakes...."
INGREDIENTS
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CAKE: One 18.25-ounce box of chocolate cake mix 1 cup all-purpose flour 1 cup granulated white sugar 3/4 teaspoon salt 1 1/3 cups water 2 tablespoons vegetable or canola oil 1 teaspoon vanilla extract 1 cup sour cream 4 large eggs CHOCOLATE BUTTERCRE