01 - Preheat the oven to 375°F.
02 - In a large mixing bowl, combine the softened cream cheese, sour cream, ranch dressing, hot sauce, and melted butter. Mix until smooth and well incorporated.
03 - Fold in the shredded chicken, cheddar cheese, and blue cheese (if using) until evenly distributed throughout the mixture.
04 - Transfer the mixture to a medium baking dish or oven-safe skillet. Spread the dip evenly across the surface.
05 - Bake for 20 to 25 minutes, or until hot and bubbly throughout and the top begins to brown slightly.
06 - Remove from the oven and let cool for 5 minutes to allow the dip to set slightly for easier serving.
07 - Serve warm with fresh celery sticks for dipping and a refreshing crunch.