INGREDIENTS
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2‑1/3 cups all-purpose flour, divided
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3/4 cup plus 1 tablespoon sugar, divided
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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3/4 cup plus 3 tablespoons cold unsalted butter, cut into small pieces, divided
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4 to 5 tablespoons ice water
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1 egg, separated
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7 medium Jonathan or Granny Smith apples, peeled, cored and sliced
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1 tablespoon lemon juice
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1‑1/4 teaspoons ground cinnamon
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1 tablespoon sour cream
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