INGREDIENTS
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For the Cake Batter
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2 cups all-purpose flour
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1 cup Dutch-process cocoa powder
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1 1/2 cups sugar
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1/2 cup dark brown sugar packed
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1 3/4 teaspoons baking powder
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1 teaspoon baking soda
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1 teaspoon kosher salt
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3 eggs
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1 cup buttermilk
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1 cup freshly brewed coffee cooled and lukewarm
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1/4 cup vegetable oil
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2 teaspoons vanilla extract
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For the Marshmallow Filling
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1 cup salted butter, room temperature (2 sticks)
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4 teaspoons vanilla extract
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12 or 13 ounces store-bought marshmallow creme or fluff (size varies by brand)
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For the Chocolate Frosting
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4 cups powdered sugar sifted
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1/2 cup whole milk
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4 teaspoons light corn syrup
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2 teaspoons vanilla extract
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6 ounces 60% cacao dark bittersweet chocolate
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For the White Squiggle Icing:
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1 cup powdered sugar, sifted
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2 teaspoons whole milk
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2 teaspoons light corn syrup