Spaghetti Cacio e Pepe
This is a recipe that we have made in our family for many years--everyone loves it. It's a very basic and easy variation on mac 'n cheese.
Substitute butter for the olive oil if preferred. For a thicker or thinner sauce, adjust how much pasta water you add. If you add too much water, add some more cheese.
I have added other ingredients depending on my main dish to enhance flavors (like pancetta); I always experiment when creating food.