"Makes 1 (9-inch) cake..."
INGREDIENTS
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1 1/3 cups butter, softened
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2 3/4 cups sugar
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1 tablespoon vanilla extract
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6 large eggs
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4 cups all-purpose flour
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1 tablespoon baking powder
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1/2 teaspoon baking soda
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1 1/2 cups buttermilk
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1/2 cup sour cream
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12 (1-ounce) squares semisweet chocolate, chopped
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3/4 cup butter
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1 cup sour cream
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6 cups confectioners’ sugar