INGREDIENTS
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1/2 stick (1/4 cup) unsalted butter
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1 large sweet apple such as Gala or Golden Delicious, peeled, cored, and cut into 1/4-inch-wide wedges
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1/2 cup whole milk
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1/2 cup all-purpose flour
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4 large eggs
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3 tablespoons granulated sugar
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1/2 teaspoon vanilla
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1/4 teaspoon salt
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Confectioners sugar for dusting
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Special equipment: a well-seasoned 10- to 11-inch heavy cast-iron skillet or other ovenproof skillet