Preheat the Oven: Preheat your oven to 350°F (175°C).
Mix the Ingredients: In a large bowl, combine shredded chicken, cream cheese, buffalo sauce, ranch dressing, and shredded cheddar cheese. Mix until well combined.
Bake: Transfer the mixture to a baking dish and spread it evenly. Sprinkle blue cheese crumbles on top if using. Bake for 20-25 minutes until bubbly and golden.
Serve: Let the dip cool slightly before serving with celery sticks and carrot sticks.