Prep the base: In a large bowl, mash the avocado with lemon juice until mostly smooth with a few small chunks.
Make it creamy: Stir in Greek yogurt, Dijon, garlic (if using), and smoked paprika. Season with a pinch of salt and pepper.
Add crunch and herbs: Fold in celery, red onion, and dill or parsley.
Mix in the chicken: Add the shredded chicken and gently toss until everything is evenly coated.
Taste and adjust with more lemon, salt, or pepper.
Customize: Fold in any add-ins you like, such as grapes for sweetness or nuts for extra crunch.
Serve: Spoon onto toast, stuff into lettuce cups, or serve over greens. Finish with a squeeze of lemon and a crack of pepper.