INGREDIENTS
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1 cup boiling water
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1/3 cup unsweetened cocoa powder, sifted
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2 sticks (8 ounces) butter, melted
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2 large eggs, lightly beaten
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1/2 cup buttermilk
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1 teaspoon vanilla extract
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2 cups all-purpose flour
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1 cup packed light brown sugar
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1 cup granulated sugar
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1 teaspoon baking soda
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3/4 teaspoon salt
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1/2 teaspoon baking powder
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1 cup granulated sugar
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1/2 cup unsweetened cocoa powder, sifted
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1/2 cup whole milk
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4 tablespoons (1/2 stick) butter, cut into small bits
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2 tablespoons light corn syrup
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4 cups confectioners’ sugar, sifted
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2 teaspoons vanilla extract