Prep the chicken: If you haven’t already, chop or shred your cooked chicken into bite-size pieces. Set aside.
Make the avocado base: In a large bowl, add the diced avocados, lime juice, and mayonnaise or Greek yogurt if using.
Mash gently with a fork until creamy but still a little chunky.
Add the mix-ins: Stir in celery, red onion, tomatoes, cucumber, cilantro, and garlic. Sprinkle in the cumin, if using.
Fold in the chicken: Add the chicken to the bowl and gently fold everything together until evenly coated.
Season: Taste and add salt, black pepper, and red pepper flakes as needed. Add a little extra lime juice if you want more brightness.
Serve: Spoon onto toast, stuff into pita or tortillas, or serve over greens.
Add extra herbs on top if you like.