INGREDIENTS
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3/4 cup warm milk (105–115°F)
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1/2 cup plus 2 teaspoons sugar
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3 teaspoons active dry yeast (from two 1/4-oz packages)
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3 1/4 cups all-purpose flour plus additional for dusting
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2 whole large eggs
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1 large egg yolk
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1 teaspoon pure vanilla extract
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3/4 teaspoon salt
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1 1/4 sticks (10 tablespoons) unsalted butter, cut into pieces and softened
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1 large egg yolk
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1 tablespoon heavy cream or whole milk
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5 tablespoons unsalted butter, well softened
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2 (3 1/2- to 4-oz) bars fine-quality bittersweet chocolate (no more than 60% cacao if marked), finely chopped
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1/4 cup sugar