Helpful notes from The Toasty Kitchen:
Broth: Chicken broth can be substituted with vegetable or beef broth to match the flavors of your main dish.
Accurately measure ingredients: It is important to accurately measure your pasta and broth, as the entire dish is cooked in a single pot. Most of the liquid should be absorbed by the pasta as it cooks.
Sauce look runny?: Your pasta will continue to absorb liquid as it stands. If your sauce looks runny, allow to set for 5 minutes.
Storage: Leftovers will keep for 3 to 4 days in a tightly sealed container in the refrigerator. Reheat slowly over medium-low heat to help prevent the parmesan sauce from breaking.