In a large bowl, combine the chopped chicken, celery, and relish.
Add mayonnaise, black pepper, and garlic powder (if using). Mix well until everything is well coated.
Taste and add salt if needed. If the mix feels too thick, add a spoonful of mayo or a splash of pickle juice.
Cover and refrigerate for at least 30 minutes. Or eat it immediately—we’ve all been there.
Serve it in sandwiches, on crackers, over salad greens, or by the forkful from the fridge.