Quick & Cheesy Sausage Rotini

COOK pasta as directed on package, omitting salt.

MEANWHILE, cook sausage in large nonstick skillet on medium-high heat 10 min. or until done, stirring occasionally. Drain sausage; return to skillet. Add tomatoes, onions and dressing; cook 5 min. or until onions are crisp-tender, stirring occasionally.

DRAIN pasta. Toss with sausage mixture and 1/2 cup cheese; sprinkle with remaining cheese.