Cook noodles according to package directions; drain and set aside. Brown ground beef in a skillet over medium heat ; drain. Stir in tomato sauce, salt, garlic salt, and pepper. In a bowl, combine sour cream, onions,and oodles. In a greased two quart casserole dish,alternate layers of noodle mixture and beef mixture, ending with beef.Sprinkle behest on top. Bake uncovered at 350 degrees for 20-25 minutes.