INGREDIENTS
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3 cups all-purpose flour
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1/4 cup sugar
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1 tablespoon baking powder
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1/2 teaspoon baking soda
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3/4 teaspoon salt
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3/4 cup (1 1/2 sticks) cold unsalted butter, cut into 1/4-inch pieces
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1 large egg
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3/4 cup cold buttermilk (plus extra for brushing)
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1 teaspoon vanilla extract
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1 1/2 ripe peaches, thinly sliced
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1 tablespoon sugar
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1/4 plus 1/8 teaspoon ground cinnamon