INGREDIENTS
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Cooking spray
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3/4 cup sugar
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1/4 cup water
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3 cups (1/4-inch-thick) slices peeled Rome apples (about 2 large)
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1/4 cup chopped walnuts
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5.3 ounces cake flour (about 1 1/3 cups)
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1 1/2 teaspoons baking powder
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1/4 teaspoon salt
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2/3 cup sugar
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3 tablespoons butter, softened
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2 large egg yolks
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1 teaspoon vanilla extract
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1/2 cup 1% low-fat milk
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3 large egg whites