INGREDIENTS
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Topping
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2 Cups All-purpose flour
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1 Cup Sugar
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2 Teaspoons Baking powder
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1 1/2 Sticks unsalted butter, melted
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Filling
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4 Packages (6 ounces each) Driscoll's Blackberries
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3 Tablespoons Cornstarch
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1/4 Cup Sugar plus 1 teaspoon, divided