Mix the filling: In a medium bowl, combine shredded chicken, hot sauce, Greek yogurt, garlic powder, and onion powder. Mix well until evenly coated.
Prepare celery: Wash and dry celery sticks. Arrange them on a platter.
Stuff celery: Spoon the buffalo chicken mixture into the hollow part of each celery stick. Press gently to secure the filling.
Garnish: Sprinkle with green onions or parsley for a fresh finish. If desired, add a small amount of blue cheese crumbles (check points if used).
Serve and enjoy: These are great as a snack, party appetizer, or quick protein-packed bite.