Cook and stir chicken in large skillet sprayed with cooking spray on medium heat 4 min. or until done.
Add onions and peppers; cook 4 to 5 min. or until crisp-tender. Stir in salsa and beans; cook 3 min. or until heated through, stirring occasionally.
Spoon 1/4 cup chicken mixture onto half of each tortilla; sprinkle with cheese. Fold tortillas in half. Add quesadillas, in batches, to separate large skillet sprayed with cooking spray; cook on medium heat 2 min. on each side or until lightly browned on both sides.