In a large mixing bowl, combine the shredded chicken, pineapple chunks, red bell pepper, celery, and red onion.
In a separate small bowl, whisk together the mayonnaise, Dijon mustard, honey, lime juice, garlic powder, salt, and pepper until smooth.
Pour the dressing over the chicken mixture and stir until everything is well coated.
If using, fold in the chopped cilantro for added flavor.
Chill the salad in the refrigerator for at least 30 minutes to allow the flavors to meld.
Serve the Hawaiian chicken salad on a bed of lettuce leaves or in a sandwich.