1Heat oven to 350ºF. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Cook and drain shells as directed on package.
2Meanwhile, mix remaining ingredients except pasta sauce and Parmesan cheese.
3Fill each cooked pasta shell with about 2 tablespoons vegetable mixture; place filled sides up in baking dish. Spoon pasta sauce over shells. Sprinkle with Parmesan cheese.
4Cover tightly with foil; bake 50 to 60 minutes or until hot.