Coat chicken with flour. Arrange chicken in single layer with skins down in melted butter in baking dish. (7 1/2x12x2 inches). Bake uncovered in moderately hot oven (425 degrees F.) for 30 minutes. Turn chicken, bake until brown, 15 to 20 minutes or until tender. Pour off excess fat. Combine Carnation, soup, cheese, salt and pepper. Add onions and mushrooms to chicken. Pour Carnation mixture over chicken. Sprinkle with paprika. Cover dish with foil. Reduce oven temperature to 325 degrees F. and continue baking for 15 to 20 minutes.