INGREDIENTS
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1-1/2 cups all-purpose flour
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1/2 cup whole wheat flour
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1 tablespoon baking powder
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2 teaspoons packed brown sugar
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1/2 teaspoon ground cinnamon
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1/2 teaspoon salt
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3 eggs, separated
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1 cup milk
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1/4 cup melted butter, plus extra for waffle iron
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1 teaspoon vanilla extract
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1/2 sweet apple, such as Fuji or Gala, cored, and grated