In a Dutch oven combine beef broth and diced tomatoes. Fill the empty diced tomatoes can with water and add to pot. Stir in meatballs, tortellini, spinach, and ¾ cup Parmesan cheese. Add salt and black pepper to taste.
Cook 25 minutes, stirring occasionally. Add heavy cream and cook 5 minutes.
Serve with bread and additional Parmesan cheese. Makes 6 to 8 servings.