1Heat oven to 400°F. Spray 8-inch square (2-quart) baking dish with cooking spray. In small bowl, mix seasoned crumbs (from Chicken Helper box) and melted butter; set aside.
2In 2-quart saucepan, stir uncooked pasta and sauce mix (from Chicken Helper box), hot water and milk; heat just to boiling, stirring frequently. Reduce heat; simmer uncovered about 10 minutes, stirring frequently, until pasta is tender.
3In baking dish, mix chicken, frozen peas, mushrooms and pasta. Sprinkle crumb mixture on top. Bake uncovered 15 to 20 minutes or until crumbs start to brown and casserole is bubbling. Serve with grated Parmesan cheese.