INGREDIENTS
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1 cup all-purpose flour
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1 cup sugar
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1/3 cup unprocessed cocoa powder
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1 teaspoon baking soda
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 egg, at room temperature
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1/2 cup buttermilk, at room temperature
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1/2 cup hot coffee or hot water
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1/4 cup vegetable oil
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1 1/2 teaspoons vanilla extract
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1 cup (2 sticks) unsalted butter, at room temperature
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3-4 cups powdered sugar
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2 teaspoons pure vanilla extract
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Pinch of salt
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2-3 tablespoons heavy cream
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6-7 snack size Kit Kats, chopped finely (or processed in a food processor)