INGREDIENTS
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1 18 1/4-ounce package yellow cake mix
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1/2 cup sweetened flaked coconut
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1/2 cup (1 stick) unsalted butter, room temperature
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4 small pippin apples, peeled, cored, thinly sliced
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1/4 cup plus 2 tablespoons sugar
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1 teaspoon cinnamon
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1 cup sour cream
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1 egg