In a large bowl, combine 2 ½ cups shredded or chopped chicken cooked chicken, ¾ cup diced dill pickles, ⅓ cup diced celery, and ⅓ cup sliced green onions.
In a medium bowl, add ½ cup mayonnaise, 2 tablespoons dill pickle juice, ½ teaspoon garlic powder, 1 teaspoon dried dill or fresh dill, 1 tablespoon Dijon mustard, ½ teaspoon Kosher salt, and ¼ teaspoon black pepper. Whisk to combine.
Pour the dressing over the chicken mixture and stir well to coat the ingredients into the dressing.
Enjoy on croissants, bread, or crackers for serving.