INGREDIENTS
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1⅔ cup white cake flour
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1 cup white whole-wheat flour (100% whole-grain flour)
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2 ¼ teaspoons baking powder
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½ teaspoon salt
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1 cup milk
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4 large eggs, separated
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1 ½ teaspoons pure vanilla extract
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2 sticks (1/2 pound) butter, at room temp
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1 ¼ cups + 1 tablespoon sugar, divided