Place the beef stew meat, onion, carrots, celery, diced tomatoes, beef broth, cannellini beans, and Italian seasoning into the slow cooker.
Stir to combine, then cover and cook on low for 7 to 8 hours until the beef is tender.
Stir in the pasta, cover again, and cook on high for 20 to 30 minutes until the pasta is tender.
Taste and add salt and black pepper as needed.
Ladle into bowls and top each serving with grated Parmesan cheese.