COOK pasta as directed on package, omitting salt.
MEANWHILE, cook sausage and onions in large nonstick skillet on medium heat, stirring occasionally to break up sausage. Add zucchini and squash; cook and stir 6 to 7 min. or until sausage is done and vegetables are crisp-tender. Stir in tomatoes and cooking creme; cook and stir 3 min.
DRAIN pasta; place on platter. Top with sauce.