INGREDIENTS
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1 3/4 cups all-purpose flour
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3/4 cup cornmeal
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4 teaspoons baking powder
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1 teaspoon baking soda
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1 teaspoon salt
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1/2 stick (1/4 cup) cold unsalted butter, cut into 1/2-inch cubes
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2 cups (6 ounces) extra-sharp Cheddar, coarsely grated
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3 tablespoons finely grated Parmigiano-Reggiano
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3 scallions, finely chopped
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2 garlic cloves, minced
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1 1/3 cups well-shaken buttermilk