Spray a casserole dish with cooking spray, then pour in macaroni mixture.
Top with extra cheeses and rosemary.
Bake at 350 degrees for 35-45 minutes, or until golden and bubbly on top and cooked through. (Timing will depend on how thick your macaroni is or the size of your casserole dish)
Serve as desired.
Vegetable Options
Cook or blanch, for the last couple minutes, in boiling pasta water before straining and adding to macaroni and cheese. Options include cauliflower, broccoli, peas or beans.
Chopped spinach, sweet peppers, tomatoes or a drained can of corn can be tossed with the macaroni mixture before going right into your casserole dish.
Sauteed Mushrooms and/or Onions are so wonderful added in to macaroni and cheese as well.
Meat Options
Chop, dice and cook bacon until crisp. Drain on paper towel before adding to macaroni and cheese mixture.
Cook ground sausage, beef or pork until no longer pink. Drain in colander in your sink until you are ready to add it to your cheese mixture.
Pan fry or crisp leftover ham, ham steak, pancetta or Italian ham before adding it to your cheese sauce.