Cook Spaghetti According To Package Directions. Meanwhile, In A Bowl, Combine The Chicken, 1 Cup Cheese, Soup, Milk, Pimientos If Desired, Salt And Pepper. Drain Spaghetti; Add To The Chicken Mixture And Toss To Coat. Transfer To A Greased 13-In. X 9-In. X 2-In. Baking Dish. Sprinkle With The Remaining Cheese. Bake, Uncovered, At 350 Degrees F For 20-25 Minutes Or Until Heated Through.