"The Best Marble Cake with Chocolate Buttercream is better than any bakery cake you can buy. Plus, it's so simple to make!..."
INGREDIENTS
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2 1/2 sticks butter room temperature
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3 1/2 cups powdered sugar
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3/4 cup cocoa powder
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1/4 teaspoon salt
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1 teaspoon vanilla extract
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1/4 cup heavy cream
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2 cups cake flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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2 sticks butter room temperature
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3/4 cup sugar
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1/2 cup packed light brown sugar
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2 eggs room temperature
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4 egg yolks room temperature
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1 tablespoon vanilla extract
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2/3 cup buttermilk room temperature*
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4 oz semi-sweet chocolate chopped