Preheat oven to 350°. Cook noodles according to package directions.
Meanwhile, in a large skillet, cook pork and onions over medium heat until meat is no longer pink. Drain noodles. Stir noodles, corn, soup, salt and pepper into the pork mixture.
Transfer to a greased 3-qt. baking dish. Cover and bake 30 minutes. Uncover; bake 15 minutes longer. Freeze option: Cool unbaked casserole; cover and freeze. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Preheat oven to 350°. Bake casserole as directed, increasing time as necessary to heat through and for a thermometer inserted in center to read 165°.