INGREDIENTS
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1 envelope (1/4 ounce, 2 1/2 teaspoons) active dry yeast
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1/4 cup plus 1 teaspoon granulated sugar
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1/4 cup warm water (105° to 110°F)
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6 tablespoons (3/4 stick) unsalted butter, at room temperature
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4 large egg yolks
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3/4 cup buttermilk
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1 teaspoon salt
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3 1/2 to 4 cups all-purpose flour (spooned into cup and leveled off)
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Vegetable oil for the bowl
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Flour for the work surface
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4 tablespoons (1/2 stick) unsalted butter, melted, plus more for the pan
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2/3 cup plus 3 tablespoons packed light brown sugar
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1 tablespoon ground cinnamon
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1/8 teaspoon salt