Brown and crumble sausage until cooked through on the stovetop. Place cooked sausage in the slow cooker.
Add sauce, chicken broth, cream cheese and mushrooms to the slow cooker. Don't worry about stirring in the cream cheese, just put the whole brick in.
Cover and cook on LOW for 6 hours or on HIGH or 2-3 hours.
20 minutes before serving, turn heat to high if it isn't already and stir in frozen tortellini and spinach. Cover and cook for 15 minutes or until tender and hot.