Ingredients
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1/4 cup plus 1 teaspoon warm water (100°F to 110°F), divided
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1 1/2 teaspoons active dry yeast (from 1 [1/4-ounce] envelope)
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1/4 cup plus 1 teaspoon granulated sugar, divided
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3/4 cup whole milk, warmed
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3 large eggs, beaten, divided
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4 cups bread flour (about 17 ounces)
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1 tablespoon kosher salt
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3/4 cup unsalted butter (6 ounces), softened and cut into 1/2-inch pieces
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Cooking spray
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Sesame seeds (optional)
Directions
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Stir together 1/4 cup water, yeast, and 1 teaspoon sugar in a small bowl. Let stand until foamy, about 5 minutes.
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Combine warm milk and 2 beaten eggs in the bowl of a stand mixer fitted with the dough hook attachment. Stir in yeast mixture. With mixer running on medium-low speed, gradually beat in flour and salt. Increase speed to medium, and beat until dough is very sticky, about 2 minutes. Gradually beat in remaining 1/4 cup sugar, 1 teaspoon at a time, until well incorporated, about 4 minutes. Stop mixer, and add butter. Beat on medium speed until dough is smooth, elastic, and pulls away from sides of bowl, about 8 minutes, stopping to scrape down sides of bowl if needed. Transfer dough to a bowl lightly greased with cooking spray. Cover with plastic wrap, and let rest at room temperature until doubled in volume, 1 hour to 1 hour and 30 minutes.
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Preheat oven to 375°F. Turn dough out onto a clean work surface. Divide dough into 8 (4 1/2-ounce) portions. Shape dough portions into balls, and flatten into 3 1/2-inch-wide disks. Place disks 2 inches apart on 2 parchment paper–lined baking sheets. Cover buns loosely with plastic wrap, and let rise at room temperature until almost doubled in volume, about 1 hour.
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Whisk together remaining egg and remaining 1 teaspoon water. Brush buns on 1 baking sheet with half of egg wash. Sprinkle with sesame seeds, if desired. Bake in preheated oven until golden brown and internal temperature registers 190°F, 14 to 18 minutes. Transfer buns to a wire rack, and let cool completely, about 1 hour. Repeat with remaining baking sheet of buns and remaining egg wash. Store buns at room temperature in a ziplock plastic bag for up to 3 days.