INGREDIENTS
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1/2 cup butter softened (1 stick)
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1/4 cup fresh chives finely snipped
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2 1/4 cups all purpose flour
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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3 tablespoons butter softened
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1/4 cup chopped scallions
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2 cups sharp cheddar shredded
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1/2 fresh grated Parmesan cheese
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1 cup plus 1 tablespoon buttermilk
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1 egg white beaten