INGREDIENTS
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2 - 12 ounce packages frozen mixed berries
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2 tablespoons cornstarch
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2/3 cup (packed) golden brown sugar
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1/2 cup unbleached all purpose flour
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1/2 cup old-fashioned oats
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1/2 cup finely chopped walnuts or pecans
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1/2 teaspoon ground cinnamon
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6 tablespoons (3/4 stick) chilled unsalted butter, cut into 1/2-inch cubes
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Vanilla ice cream