INGREDIENTS
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1 cup white sugar
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1 teaspoon baking powder
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3 cups all-purpose flour
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1 cup unsalted butter
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1 egg
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1 teaspoon pure vanilla extract
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1/2 teaspoon kosher salt
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2 teaspoons lemon juice
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2 cups fresh or frozen blueberries
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2 cups fresh or frozen raspberries
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1/2 cup white sugar
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3 teaspoons cornstarch