Mix together the greek yogurt, mayonnaise, fresh dill, fresh parsley, lemon juice, onion powder, salt, pepper, and celery seeds.
Stir in the chicken,feta cheese, celery, cucumbers, roasted red peppers, olives, and red onions. Taste and season if needed.
If possible, store in the fridge an hour before serving for the flavors to deepen and combine.
