INGREDIENTS
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Vegetable-oil cooking spray
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4 cups all-purpose flour
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1 tablespoon plus 1 teaspoon baking powder
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1 teaspoon fine salt
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1 cup buttermilk
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1/4 cup dark rum
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1 pound (4 sticks) butter, room temperature
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2 cups brown sugar
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1 cup granulated sugar
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10 large eggs
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1 pound confectioners' sugar
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2 to 3 tablespoons rum
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3 tablespoons whole milk