If you want to make this a complete meal, try adding cooked pieces of chicken to the mac and cheese.  You can also add other vegetables, like asparagus, cauliflower, spinach, kale, or zucchini (or whatever your favorite vegetable is). For a sharper taste, add 1/2 cup parmesan cheese to the sauce and another 1/2 cup to the breadcrumb topping. If you want to make this spicy, try adding red pepper flakes, cayenne pepper, or a dash of hot sauce.