Heat oven to 375°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray.
Cook frozen corn as directed on bag, using minimum cook time. In large bowl, mix corn, chicken, salsa, sour cream and chiles.
Arrange 6 tortillas on bottom and up sides of dish, overlapping slightly. Top with half of the chicken mixture. Repeat layers. Sprinkle with cheese.
Bake uncovered 30 to 40 minutes or until hot and cheese is melted. Let stand 5 minutes before serving.