Use less milk and add more butter for a richer sauce
Stir in shredded cheddar, mozzarella, or parmesan
Add a spoonful of cream cheese or sour cream
Mix in a little garlic powder, onion powder, or black pepper
Add a dash of hot sauce or cayenne
Use chicken broth instead of water for more flavor
Top with toasted breadcrumbs or crushed crackers
Stir in cooked bacon, ham, or sausage
Add cooked broccoli, peas, or spinach
Mix in diced tomatoes or roasted peppers
Add a little mustard or Dijon for tang
Use whole milk or heavy cream instead of skim milk
Cook the pasta slightly less for a firmer texture
Finish with extra cheese on top before serving
Add a splash of pasta water to help the sauce cling
Stir in a little shredded rotisserie chicken
Add sautéed onions or mushrooms
Mix in buffalo sauce for a spicy version
Add truffle oil sparingly for a richer flavor
Bake it after mixing for a crispy top