In a large mixing bowl, combine the chopped chicken, mayonnaise, and Dijon mustard. Stir until the chicken is evenly coated.
Add the dried cranberries, chopped pecans, celery, and red onion. Gently fold the ingredients together.
Stir in the apple cider vinegar and season the salad with salt and pepper to taste.
Cover and refrigerate for at least 30 minutes before serving to let the flavors meld.
Serve on toasted bread, croissants, crackers, or lettuce wraps, or enjoy as a protein-packed salad on its own.