brioche bun recipe

Ingredients: 3/4 cup warm milk (110°F/43°C) 2 1/4 teaspoons active dry yeast (1 packet) 3 tablespoons granulated sugar 3 1/2 cups all-purpose flour 1 teaspoon salt 3 large eggs (room temperature) 1/2 cup unsalted butter (softened) 1 egg yolk (for egg wash) 1 tablespoon water (for egg wash)