INGREDIENTS
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•6 cups tart apples, peeled and thinly sliced
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•1 teaspoon ground cinnamon
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•1/2 cup quick-cooking oats
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•1/3 cup brown sugar, packed
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•1/4 cup all-purpose flour
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•1/2 cup cold butter
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•1/2 cup chopped walnuts, optional
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•vanilla ice cream, for serving