Brown the Sausage
In a large soup pot over medium-high heat, cook the hot Italian sausage, breaking it up as it browns. Add the diced onion and continue cooking until the sausage is no longer pink and the onion is tender.Build the Broth
Stir in the chicken broth, water, diced tomatoes, mushrooms, and garlic powder. Bring the mixture to a full boil.Add the Tortellini
Once boiling, add the refrigerated cheese tortellini. Return to a boil and cook for about 5 minutes, or until the tortellini are plump and tender.Add the Greens & Seasoning
Reduce the heat to low. Stir in the fresh spinach, dried sweet basil, and black pepper. Let the soup cook for 2–3 more minutes, just until the spinach wilts.Serve
Ladle into bowls and top with shaved or shredded Parmesan cheese, if desired. Serve warm with breadsticks or garlic bread.