01 - Preheat the oven to 350°F.
02 - In a large mixing bowl, combine cream cheese, sour cream, mayonnaise, Buffalo hot sauce, garlic powder, onion powder, and black pepper. Mix until smooth and well incorporated.
03 - Fold in the shredded chicken, cheddar cheese, and blue cheese until evenly distributed.
04 - Transfer the mixture to a 1.5 to 2 quart baking dish and smooth the top with a spatula.
05 - Bake for 20 to 25 minutes, until hot and bubbly throughout.
06 - For a golden top, broil for 2 to 3 minutes at the end of baking.
07 - Serve hot with celery sticks and chips for dipping.