1Heat oven to 375°F. Cook frozen corn as directed on bag, using minimum cook time. In large bowl, mix corn, chicken, salsa, sour cream and chiles.
2Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Arrange 6 tortillas on bottom and up sides of dish, overlapping slightly. Top with half of the chicken mixture. Continue layering, ending with chicken mixture. Top with cheese.
3Bake 30 to 40 minutes or until cheese is melted and mixture is hot. Let stand 5 minutes before cutting into squares.