In a large bowl, whisk together the sour cream, mayonnaise, lemon juice, chives, dill, parsley, garlic powder, onion powder, and salt.
Add the chicken, bacon, celery, and green onions to the bowl. Stir until everything is evenly coated in the dressing. Taste and add more salt if needed.
Cover and refrigerate for at least 30 minutes (or 1-2 hours if you have time) before serving. This gives the dried herbs time to soften and the flavors time to come together.