INGREDIENTS
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3 tablespoons unsalted butter, softened
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1/4 cup plus 2 tablespoons sugar
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1 teaspoon cinnamon
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2 tablespoons all-purpose flour
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1 1/3 cups sour cream
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2/3 cup sugar
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1/4 teaspoon salt
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2 teaspoons vanilla extract
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2 large eggs
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3 tablespoons all-purpose flour
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5 large Granny Smith apples (about 2 1/4 pounds)