1. Chop or shred chicken into bite sized pieces and transfer to a medium mixing bowl. Chop apple into ½ inch cubes and transfer to bowl.
  2. Add celery, Greek yogurt, mayonnaise, pecans, red onion, Dijon mustard and garlic salt to bowl. Mix ingredients until all combined.
  3. Assemble wraps by placing about ½ cup lettuce in the center 1/3 of each wrap, top with ¼ of chicken mixture. Roll into burrito. Eat immediately or place in a to-go container for later.