Ham Casserole

Directions

1. 1
   Following package directions, cook and drain rigatoni.
2. 2
   Cook onion in oil until tender.
3. 3
   Add flour; cook 1 minute.
4. 4
   Add milk; stir with a whisk.
5. 5
   Add 1/2 of the cheese and the noodles, then put in peas and ham.
6. 6
   Mix good and put in casserole dish.
7. 7
   Top with rest of cheese.
8. 8
   Bake at 350° for 25 to 30 minutes.