INGREDIENTS
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3 tablespoons unsalted butter
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1/2 cup packed light brown sugar
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1 lb Granny Smith apples, peeled, cored, and cut into thin wedges
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1 cup all-purpose flour
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1/4 cup granulated sugar
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/2 teaspoon cinnamon
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5 tablespoons cold unsalted butter, cut into pieces
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1/2 cup well-shaken buttermilk
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Accompaniment: crème fraîche or sour cream (optional)