INGREDIENTS
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1 1/4 cups buttermilk (any fat content)
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2 tablespoons unsalted butter, cold or room temperature, plus more for slicking the pan
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3 1/4 cups unbleached all-purpose flour
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1 tablespoon granulated sugar
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1 tablespoon wheat bran (optional)
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1 teaspoon kosher salt
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2 1/4 teaspoons (a 1/4-ounce packet) instant yeast
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1 large egg
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2 teaspoons melted butter, for brushing the loaf