6–7 cups of thick-cut bread cubes (Brioche, Challah, or French bread work best); 4 large eggs; 1 cup whole milk; 1/4 cup heavy cream; 1/3 cup maple syrup or honey; 1 teaspoon pure vanilla extract; 1 teaspoon ground cinnamon; 1/4 teaspoon salt; 3 tablespoons unsalted butter, melted; 1/4 cup granulated sugar mixed with 1 tablespoon ground cinnamon (for topping)