Place the meatballs, beef broth, water, beans, diced tomatoes and mixed veggies into a large crockpot. Cook for 7 to 8 hours on Low heat or 4 to 5 hours on High heat.
20 minutes before soup is done, cook pasta according to package directions. Add to crockpot until warmed through. Ladle into bowls and top with cheese, if desired.