First add your sausage to a large pot and break up (make sure to remove the plastic skin if there is one). Remove sausage and set aside. Begin by chopping your onion and garlic. Add your diced onion to a large pot with the melted butter. Simmer for a few minutes. Add in your garlic and simmer for another minute. Mix in the flour until it becomes thicker. Add in your canned tomatoes and tomato paste. Mix well and return to a simmer. Add your chicken broth and bring back to a boil. Place the tortellini in the pot and boil for 6-8 minutes covered or until cooked. Add your cooked sausage back in. Add your heavy cream and mix. Season with your preferred seasonings. Add your spinach and mix in for a couple minutes. Finally add in as much Parmesan as you’d like. Enjoy!