01 - Preheat the oven to 350°F.
02 - In a large mixing bowl, blend cream cheese, sour cream, ranch dressing, hot sauce, garlic powder, and black pepper until smooth.
03 - Fold in shredded chicken, cheddar cheese, and blue cheese crumbles if using, ensuring an even mixture.
04 - Transfer the mixture into an 8-inch square baking dish, smoothing the surface evenly.
05 - Sprinkle additional cheddar cheese on top, if preferred.
06 - Bake for 20 to 25 minutes until the dip is bubbly and golden around the edges.
07 - Allow the dip to cool slightly, then garnish with chopped chives or green onions if desired.
08 - Serve warm alongside celery sticks for dipping.