16 ounces medium or small macaroni elbows16 ounces Cabot Extra Sharp Cheddar, grated (about 4 cups),
divided1 cup Panko breadcrumbs or crumbled cornbread10 tablespoons Cabot Salted Butter 1/2 cup King Arthur Unbleached All - Purpose Flour4 cups hot milkOptional additions: cooked and diced bacon, ham, sausage or vegetables