INGREDIENTS
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1 cup granulated sugar
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3 cups all-purpose flour
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1 teaspoon baking powder
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1 cup 2 sticks unsalted butter,chilled, and cut into small squares
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1 egg
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1/4 teaspoon salt
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1 pinch ground cinnamon (optional)
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1/2 cup granulated sugar
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3 tablespoons cornstarch
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4 cups fresh blueberries (or frozen, but do not thaw)