INGREDIENTS
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1 cup blueberries
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1 tablespoon granulated sugar
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1/2 teaspoon vanilla extract
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1 teaspoon cornstarch
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2 tablespoons all-purpose flour
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3 tablespoons oats
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2 tablespoons firmly packed brown sugar
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1/4 teaspoon ground cinnamon
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pinch of salt
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2 tablespoons unsalted butter, cold and cut into cubes