In a skillet, cook the sausage over medium heat until no longer pink; drain. Transfer to a 5-qt. slow cooker; add the next 13 ingredients. Cover and cook on high for 3-4 hours or until the vegetables are tender.
Cook tortellini according to package directions; drain. Stir into slow cooker; cover and cook 30 minutes longer. Serve with Parmesan cheese if desired.