1/2 cup half-and-half , heated to 110 degrees
1 tablespoon instant or rapid-rise yeast
1/4 cup sugar
2 large eggs , 1 whole and 1 separated
2 1/2 cups all-purpose flour
1 1/4 teaspoons salt
1 teaspoon water
2. Whisk melted butter, half-and-half, yeast, and 1 teaspoon sugar in large liquid measuring cup until yeast dissolves, then whisk in 1 whole egg and 1 egg yolk. In bowl of standing mixer fitted with dough hook, mix flour, remaining sugar, and 1 teaspoon salt until combined. With mixer on low, add warm half-and-half mixture in steady stream and mix until dough comes together, about 1 minute. Increase speed to medium and mix until dough is smooth and comes away from sides of bowl, about 6 minutes. Turn dough out onto clean surface and knead to form smooth, round ball. Transfer dough to prepared bowl, cover with plastic, and place in warm oven. Let rise until doubled in size, about 1 hour.
3. Turn dough out onto lightly floured surface and roll into 12-inch circle. Spread softened butter over dough, sprinkle with remaining salt and using pizza cutter, cut dough into 12 wedges, roll each wedge, and arrange (with pointed tip of dough underneath each roll) on prepared baking sheet. Cover loosely with plastic wrap and return to oven until doubled in size, about 1 hour. (At this point, rolls can be refrigerated for up to 24 hours.)
4. Remove rolls from oven and discard plastic wrap; heat oven to 350 degrees. Whisk remaining egg white and water in small bowl. Brush each roll twice with egg white mixture and bake until golden brown, about 20 minutes, rotating baking sheet halfway through cooking. Cool rolls on baking sheet 10 minutes. Serve. (Once completely cool, rolls can be stored in airtight container at room temperature for 2 days.) Makes 12 rolls