INGREDIENTS
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2 1/2 cups cake flour, plus extra for dusting
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1 1/4 teaspoons baking powder
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1/4 teaspoon baking soda
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3/4 teaspoon salt
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1 3/4 cups sugar
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10 tablespoons butter, melted and cooled slightly
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1 cup buttermilk, room temperature
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3 tablespoons vegetable oil
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2 teaspoons vanilla extract
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6 large egg yolks, room temperature
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3 large egg whites, room temperature