In a large mixing bowl, combine the chicken, cranberries, pecans, and celery.
In a separate small bowl, whisk together the mayonnaise, Greek yogurt, Dijon mustard, garlic powder, salt, and pepper.
Pour the dressing over the chicken mixture and stir until everything is evenly coated.
Taste and adjust seasoning if necessary. Chill before serving for best flavor.
Serve on croissants, sandwich bread, lettuce wraps, or as a salad topping.