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 desired, ensuring an even mixture.
04 - Transfer the mixture to an 8-inch square baking dish and smooth the top; sprinkle extra cheddar cheese if preferred.
05 - Bake for 20 to 25 minutes until the dip is bubbly and golden around the edges.
06 - Allow to cool slightly, garnish with chives or green onions if using, and serve warm alongside celery sticks.