"To make decorative icing lines, gently drag the rounded end of a butter knife up the sides and across the top of the cake...."
INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, room temperature, plus more for pans
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2 1/2 cups all-purpose flour, plus more for pans
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3/4 cup cocoa powder
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1 teaspoon baking soda
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1/4 teaspoon salt
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1 cup granulated sugar
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1 cup light-brown sugar
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3 large eggs
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2 teaspoons vanilla extract
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1 1/2 cups buttermilk
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1 cup (2 sticks) unsalted butter, room temperature
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2 jars (7.5 ounces each) marshmallow cream
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2/3 cup cocoa powder
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2/3 cup semisweet chocolate chips, melted and cooled
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1 tablespoon vanilla extract