Combine mayonnaise, Dijon mustard, lemon juice, salt, pepper, garlic powder, and brown sugar in a large mixing bowl. Whisk the ingredients together until well combined, creating a flavorful dressing.
Add the finely chopped celery to the dressing. Then, gently fold in the finely diced red onion.
Finally, add the shredded chicken breast to the bowl. Mix the chicken salad until everything is evenly coated by the dressing.
Once all the ingredients are combined, taste the salad and adjust the salt and pepper according to your preference.
Chill the chicken salad in the refrigerator for at least 30 minutes to allow the flavors to meld. Serve your deli chicken salad on its own, in a sandwich, as a lettuce wrap, or with your preferred accompaniment.
Notes
Make the dressing first – Making the dressing first ensures a smooth chicken salad. Trust me on this!
Chill time – Let the salad chill in the refrigerator for at least 30 minutes before serving to allow the flavors to meld. This enhances the overall taste.