In a large bowl combine cooked chicken, cream cheese, buffalo sauce, ranch dressing, and 6 ounces of shredded cheddar cheese and stir together until mixed.
Spread the mixture into a greased 2 quart casserole dish. Cover the dish with aluminum foil.
Place in the oven to bake for 20 minutes.
After 20 minutes uncover the dish and sprinkle the remaining 2 ounces of cheddar cheese over the top. Place back in the oven to continue to bake for 10 minutes or until the cheese on top is melted and bubbling.
Remove from the oven and serve with chips, crackers, or veggies.