01 - Preheat the oven to 350°F. Lightly grease an 8x8 inch baking dish with cooking spray or a small amount of butter.
02 - In a large bowl, combine softened cream cheese, sour cream, hot sauce, ranch dressing, garlic powder, and onion powder. Mix until completely smooth and creamy.
03 - Fold in shredded chicken, cheddar cheese, and mozzarella cheese until well distributed throughout the mixture.
04 - Spread the mixture evenly in the prepared baking dish, smoothing the top with a spatula.
05 - Bake for 20-25 minutes, or until hot and bubbly with golden edges.
06 - Remove from oven and let cool for 5 minutes. Serve warm with celery sticks for dipping.