In a large mixing bowl, shred about 2 cups of cooked chicken, ensuring there are no large chunks. Add finely chopped onions and well-drained, chopped dill pickles to the bowl. Stir the mixture until the ingredients are evenly distributed.

In a separate bowl, combine 1/2 cup of Greek yogurt, 1/4 cup of mayonnaise, a few tablespoons of relish, and a teaspoon of mustard. Whisk for about 30 seconds until smooth.

Pour the creamy dressing over your chicken mixture and gently toss everything together until well coated.

Taste your mixture, then sprinkle in salt and freshly ground pepper according to your preference, mixing in freshly chopped chives and dill if desired.

Cover the bowl with plastic wrap or transfer to an airtight container. Chill in the refrigerator for at least 2 hours, ideally overnight.