HEAT oven to 375°F.
PLACE sausage and peppers in 13x9-inch baking dish sprayed with cooking spray.
BAKE 15 to 20 min. or until sausage is done. Meanwhile, cook pasta as directed on package, omitting salt.
DRAIN sausage mixture and pasta. Return sausage mixture to baking dish. Add pasta and spaghetti sauce; mix lightly. Top with cheese mixture.
BAKE 15 to 20 min. or until heated through.