Preheat the Oven: Start by preheating your oven to 350°F (175°C).

Mix Ingredients: In a large mixing bowl, combine the shredded cooked chicken, softened cream cheese, buffalo sauce, ranch dressing, shredded cheddar cheese, and blue cheese crumbles if you're using them.

Transfer to Baking Dish: Pour the mixture into an oven-safe baking dish. You can use a 9-inch pie dish or an 8x8 inch square baking dish.

Bake: Place the dish in the preheated oven and bake for about 20-25 minutes, or until the dip is hot and bubbly.

Stir and Serve: Once done, take the dish out of the oven, give it a good stir, and let it cool for a few minutes. Serve warm with celery sticks, carrot sticks, and/or tortilla chips.