Pour chicken broth in slow cooker and add beans (do not drain), diced tomatoes (do not drain), onion, garlic, celery, Italian seasoning and frozen meatballs.
Set slow cooker on low for 6-8 hours.
About 30-45 minutes before you’re ready to eat, add frozen tortellini.
Allow to cook thoroughly.
Add salt & pepper to taste
Ladle into bowls and top with grated Parmesan cheese.