MIX salsa, dressing and chili powder; spread onto tortillas.

LAYER chicken and cheese on half of each tortilla; fold over to enclose filling.

HEAT large skillet sprayed with cooking spray on medium heat. Add quesadillas, 2 at a time; cook 4 to 5 min. on each side or until lightly browned on both sides. Repeat with remaining quesadillas. Cut each quesadilla into 3 wedges to serve.