COOK bacon in medium skillet on medium-high heat 2 min. Add chicken; cook and stir 5 min. or until evenly browned. Stir in corn, beans and salsa; cook on medium heat 5 min. or until juices have almost evaporated. Remove from heat.
TOP tortillas with chicken mixture and cheese; fold in half.
HEAT large nonstick skillet on medium-high heat. Add quesadillas, in batches; cook 2 min. on each side or until each is browned on both sides and cheese is melted.