INGREDIENTS
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For the Cake:
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2 cups all-purpose flour
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1/2 cup unsweetened cocoa powder
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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2 sticks (8 ounces) unsalted butter, at room temperature
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1 1/2 cups sugar
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2 large eggs
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2 large egg yolks
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1 teaspoon pure vanilla extract
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1 cup buttermilk
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4 ounces bittersweet chocolate, melted and cooled (optional)
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For the Chocolate-Malt Buttercream
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6 ounces bittersweet chocolate, coarsely chopped
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1/3 cup (packed) light brown sugar
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1/4 cup malted milk powder
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1 tablespoon unsweetened cocoa powder
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1/4 cup boiling water
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2 sticks (8 ounces) unsalted, butter, at room temperature
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Pinch of salt
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3/4 teaspoon pure vanilla extract
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2 1/4 cups confectioners' sugar, sifted