Cook noodles, to al dente, according to the box instructions. Drain and set aside.
In a medium bowl, combine ½ cup butter, cooked chicken, soup, sour cream, salt, pepper and chicken broth. Mix well and then add in cooked noodles. Stir until the noodles are evenly coated.
Spray a 9x13 baking dish and pour in the noodle mixture. Sprinkle cheeses on top. Bake at 350 degrees for 40-45 minutes.