INGREDIENTS
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for the fruit layer: 4 cups fresh blueberries 1/2 cup sugar 3 teaspoons cornstarch for dough: 1 cup sugar 1 teaspoon baking powder 3 cups all-purpose flour 1 cup unsalted butter (2 sticks) 1 egg 1/4 teaspoon salt (optional) 1 pinch ground cinnamon (o