Preheat oven to 400°.
Coat one side of tortillas with cooking spray; place, coated side down, on a large baking sheet. Place 1/3 cup chicken over half of each tortilla; top each with 1/4 cup corn and 1/3 cup cheese. Fold tortillas in half over filling, pressing firmly.
Bake at 400° for 10 minutes or until tortillas are crisp and cheese is melted. Cut each tortilla into quarters. Serve with salsa and sour cream.