INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, softened
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1 1/2 cups sugar
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2 cups all-purpose flour
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2 teaspoons baking powder
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1/4 teaspoon salt
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6 large egg whites (3/4 cup)
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3/4 cup milk
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2 teaspoons vanilla extract
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2 (9-inch) diameter by 1 1/2-inch deep layer pans or 1 (13 by 9 by 2-inch) pan, buttered and bottoms lined with parchment or waxed paper