01 - Set the oven to 350°F and allow it to reach temperature.
02 - In a large bowl, blend cream cheese, sour cream, ranch dressing, hot sauce, garlic powder, and black pepper until smooth.
03 - Gently fold the shredded chicken, cheddar cheese, and blue cheese crumbles (if using) into the mixture until evenly combined.
04 - Spoon the mixture into an 8-inch square baking dish, smoothing the surface evenly.
05 - Sprinkle a small amount of extra cheddar cheese on top if desired.
06 - Place the dish in the oven and bake for 20 to 25 minutes until the dip is bubbling and golden at the edges.
07 - Allow to cool slightly before adorning with chopped chives or green onions, then serve warm alongside celery sticks.