01 - Preheat oven to 350°F.
02 - In a large bowl, combine softened cream cheese, sour cream, ranch dressing, buffalo hot sauce, garlic powder, and black pepper. Mix until smooth.
03 - Fold in shredded chicken, mozzarella cheese, and blue cheese if using until evenly combined.
04 - Spread the mixture evenly in an 8x8 inch baking dish.
05 - Bake for 20 to 25 minutes until hot and bubbly.
06 - Remove from oven and let rest for 5 minutes before serving.
07 - Serve warm accompanied by fresh celery sticks.