INGREDIENTS
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2-1/4 cups sifted cake flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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1/2 teaspoon ginger
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1/2 pound (2 sticks) unsalted butter, at room temperature
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2 cups sugar
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4 large egg yolks
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1 cup milk
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2 teaspoons vanilla extract
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1 cup sour cream
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4 large egg whites