INGREDIENTS
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1 1/2 cups all-purpose flour
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1/2 cup cake flour, (not self-rising)
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3 tablespoons granulated sugar
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2 1/2 teaspoons baking powder
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3/4 teaspoon salt
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4 ounces (1 stick) cold unsalted butter, cut into small pieces
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1 cup (1/2 pint) blueberries
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1/2 cup low-fat buttermilk
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1 large egg, plus 1 large egg lightly beaten for egg wash
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1/2 teaspoon pure vanilla extract
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Fine sanding sugar, for sprinkling