INGREDIENTS
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•2 cups all-purpose flour, plus more as needed
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•1 tablespoon baking powder
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•1½ teaspoons kosher salt
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•12 tablespoons (1½ sticks) cold unsalted butter, diced
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•½ cup cold buttermilk, shaken
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•1 cold extra-large egg
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•1 cup grated extra-sharp Cheddar
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•1 egg, beaten with 1 tablespoon water or milk