Bring the stock to a simmer in a large pot over medium heat.
Stir in the tortellini and simmer gently for 3 minutes.
Stir in the spinach, garlic, tomatoes, Italian seasoning
Season with salt and pepper
Return to a simmer and cook for 2 to 3 more minutes
Serve hot with the grated Parmesan cheese
Want to add protein? Add cooked chicken strips or saute some Italian sausage and add to soup