Spray large nonstick skillet with nonstick cooking spray. Heat over medium-high heat until hot. Add chicken; cook and stir 5 to 6 minutes or until no longer pink in center.
Stir in corn, salsa and olives. Reduce heat to medium; cook 4 to 6 minutes or until thoroughly heated.
Meanwhile, warm tortillas as directed on package. Spoon 1/4 of chicken mixture onto half of each tortilla. Fold tortillas over. If desired, serve with light sour cream and additional salsa.