Ingredients:

• 1 tablespoon unsalted butter, softened
• 16-ounce French brioche loaf, cut into 3/4-inch cubes (12 cups)
• 8 large eggs
• 4 cups half and half
• 2 tablespoons granulated sugar
• 1 tablespoon brown sugar
• 2 teaspoons pure vanilla extract
• 1 1/2 teaspoons ground cinnamon
• 1/4 teaspoon ground nutmeg
• 1/4 teaspoon kosher salt
• Powdered sugar, for sprinkling, optional
• Pure maple syrup, for topping, optional