Preheat your oven to 375°F (190°C).
In a medium mixing bowl, combine the cooked shredded chicken, Greek yogurt, softened cream cheese, buffalo sauce, garlic powder, and onion powder until well incorporated.
Transfer the mixture into a small oven-safe ramekin or baking dish, smoothing the top with a spoon.
Sprinkle the shredded cheddar cheese evenly over the top of the chicken mixture.
Place the dish in the oven and bake for 15-20 minutes, or until the dip is heated through and the cheese is golden and bubbling.
While the dip bakes, slice the celery and carrots into sticks for dipping.
Remove the bake from the oven and garnish with fresh green onions and sliced avocado.
Serve immediately while hot alongside the fresh vegetable sticks.