This was adapted from several recipes since I didn't have the right stuff to make any of them. I think any hard cheese would work well. 2 of my 3 picky kids liked it.
Spread sliced potatoes in 11x7 pan (spray sides with Pam).
Make white sauce. Melt 4 Tbs butter, stir in flour, salt and pepper. Remove from heat, stir in milk. Return to medium heat and stir constantly to boil, boil one minute. Add cheeses and stir until melted.