Step 1

Cook pasta as directed on package, omitting salt.

Step 2

Meanwhile, cook mushrooms in large skillet sprayed with cooking spray on medium heat 3 to 5 min. or until tender, stirring frequently. Drain mushrooms; discard liquid. Return mushrooms to skillet. Add sausage and onions; cook 6 to 8 min. or until sausage is done, stirring occasionally. Stir in sauce; cook 5 min. or until heated through, stirring occasionally.

Step 3

Drain pasta; place on serving platter. Top with sauce; sprinkle with cheese.