INGREDIENTS
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⅓ cup unsweetened Dutch process cocoa powder
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⅓ cup hot coffee
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1¾ cups cake flour
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1 teaspoon baking powder
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½ teaspoon salt
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1 cup unsalted butter, at room temperature
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1 cup sugar
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2 large eggs
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2 teaspoons vanilla extract
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¼ cup buttermilk
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¾ cup dark chocolate chips
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1½ cups powdered sugar
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3 tablespoons unsweetened Dutch process cocoa powder
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pinch of salt
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2 teaspoons vanilla extract
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2 to 4 tablespoons milk or water