Brioche Loaf Recipe

Ingredients

• 1/2 cup warm water (about 110°F)
• 1 tablespoon instant yeast
• 1/2 cup (63g) unbleached all-purpose flour
• 3 large eggs
• 1 large egg yolk
• 2 tablespoons sugar
• 1 teaspoon kosher salt
• 2 3/4 cups (340g) unbleached all-purpose flour, divided
• 8 tablespoons (1 stick) unsalted butter, room temperature
• Cooking spray, for the loaf pan
• 1 large egg beaten with 1 tablespoon water (for the egg wash)