INGREDIENTS
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1 1/4-ounce envelope active dry yeast (about 2 1/4 teaspoons)
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1 tablespoon sugar
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1 cup buttermilk, warmed
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4 tablespoons ( 1/2 stick) unsalted butter, room temperature
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2 tablespoons vegetable oil
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2 teaspoons kosher salt
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3 1/2 cups unbleached bread flour, divided, plus more
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Nonstick vegetable oil spray
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Cornmeal (for dusting)