INGREDIENTS
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Nonstick cooking spray or vegetable oil
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1/2 cup cake flour
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1/4 cup all-purpose flour
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1 teaspoon baking powder
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1/4 teaspoon salt
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2 tablespoons milk, preferably whole
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4 tablespoons unsalted butter
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1/2 teaspoon vanilla extract
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5 large eggs, at room temperature
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3/4 cup granulated sugar
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1/4 teaspoon cream of tarter
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Seven-Minute Filling, er, Frosting