Mix salsa, dressing and chili powder until blended; spread onto tortillas
Place chicken on half of each tortilla; top with cheese. Fold tortillas in half to enclose filling
Heat large heavy skillet sprayed with cooking spray on medium heat. Add quesadillas, 2 at a time; cook 4 to 5 min. on each side or until cheese is melted and quesadillas are lightly browned on both sides. Repeat with remaining quesadillas
