INGREDIENTS
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Crust/topping
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1 1/2 cups all purpose flour
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1 1/2 cups old-fashioned oatmeal
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3/4 cup brown sugar
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1/2 teaspoon cinnamon
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1 cup cold butter, cut to small pieces
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Filling
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3 1/2 cups blueberries
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1/2 cup white sugar
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3 Tablespoons cornstarch
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1 Tablespoon fresh lemon juice