Slice sausage into rounds. Pour olive oil into a large saucepan over medium heat. Add in onion, tomatoes, garlic and sausage. Cook about 5 minutes, until onions are soft. Add in spinach, pasta and chicken broth. Increase heat to high and stir often, to break up pasta and prevent sticking. Bring broth to a boil and then decrease heat to medium. Set timer and cook for 9 minutes, stirring often. Much of the broth should be absorbed by the pasta.

Remove from heat and immediately add in heavy cream and cubes of cream cheese. Stir to incorporate until sauce is smooth.

Top with Parmesan cheese and fresh basil, if desired.