1. Preheat oven to 450 degress.
2. Place flour in a medium saucepan.
3. Gradually add milk; stir until blended.
4. Bring to a boil over medium heat.
5. Cook 6 minutes or until thick, stir constantly.
6. Add pepper and cheese; cook 2 minutes or until cheese melts.
7. Stir constantly.
8. Combine cheese sauce, noodles, onions and corn in a bowl.
9. Spoon into a casserole lightly brushed with oil, sprinkle some of the cheese on top.
10. Bake for 10 minutes or until bubbly.

Image: Flickr/creativecommons wordridden