In a large mixing bowl, combine the shredded or diced chicken, diced celery, Greek yogurt (or mayonnaise), Dijon mustard, dried cranberries, chopped pecans, salt, and black pepper.
3 cups cooked shredded chicken, 2 stalks celery, ½ cup yogurt, 1 tablespoon mustard, ½ cup dried cranberries, ½ cup toasted pecans, Salt and pepper to taste