Cut the vegetables evenly: Keeping the potatoes, carrots, celery, and green beans close in size helps them cook at the same rate.
Add the pasta near the end: Alphabet pasta cooks quickly and can become too soft if it simmers for too long.
Stir the pasta occasionally: Small pasta shapes can settle on the bottom of the pot, so stir while they cook to prevent sticking.
Add more broth as needed: The pasta will continue absorbing liquid as the soup sits. Stir in extra vegetable broth when reheating if the soup becomes too thick.
Cook the pasta separately for meal prep: If you plan to store the soup for several days, cook and store the alphabet pasta separately so it does not become mushy.