In a large stock pot, stir together the broth, tomatoes, onions, and Italian seasoning; bring to a boil.
Add the pasta, meatballs, and frozen vegetables. Return heat to a boil. When the soup begins to boil, reduce the heat to low. Simmer the soup covered for about 10 minutes, or until pasta and vegetables are tender.
Add the soup to bowls. Add the shredded cheese, if you choose too. (this soup goes great with a side of some garlic toast)