HEAT oven to 425ºF.
DIP chicken in egg then in cracker crumbs, turning to evenly coat both sides of each breast.
PLACE in 13x9-inch baking dish sprayed with cooking spray; drizzle with butter.
BAKE 20 min. or until chicken is done (165ºF). Top with salsa and cheese; bake 5 min. or until cheese is melted.