Preheat oven to 350° F. Mix cream cheese and 1.5 cups of cheese together in a bowl. Add in buffalo sauce and ranch dressing and stir. Add in chicken gradually and stir. Add to an uncreased baking dish. Add ½ cup of cheese left over to the top of the dip. Bake uncovered for 20-25 minutes, or until the cheese is melted and bubbling.