Halve and pit the avocado. Mash 3 tablespoons and add to a large bowl. Dice the rest and set aside. Add remaining dressing ingredients to the bowl and whisk to combine.
Add finely diced chicken, celery, red onion, parsley, and diced avocado to the bowl. Season to taste (I add 1/4 tsp each salt and pepper). Stir gently to combine. Adjust seasoning and add more mayo (1–4 tablespoons) if needed.
Enjoy on toasted bread with mayo, in a lettuce wrap, or with pita chips. Best enjoyed immediately, as avocado browns after 1–2 hours.
Video
Notes
Note 1: Dice the chicken small for a creamy, flavorful mix—big chunks throw off the texture.Note 2: Wait until the avocado is fully ripe for the best creaminess and flavor.Storage: Best eaten the same day since the avocado browns over time. Freezing not recommended.