INGREDIENTS
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3 tablespoons all-purpose flour
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2 tablespoons granulated sugar
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6 cups fresh blueberries
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1/4 cup lemon juice
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1 cup packed brown sugar
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3/4 cup all-purpose flour
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3/4 cup quick-cooking rolled oats
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1 1/4 teaspoons ground cinnamon
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1/2 cup cold butter
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Vanilla ice cream, for serving (optional)