Sliced potatoes
Diced onions
Diced ham
Salt and pepper
Cheddar cheese
1 recipe white sauce (below)

FIRST LAYER: Sliced potatoes.

SECOND LAYER: Diced onions and ham

THIRD LAYER: Sliced potatoes

Add salt and pepper lightly between all layers. Add white sauce.

WHITE SAUCE:

2 tbsp. butter
2 tbsp. flour
1 c. milk
Salt and pepper

Make more sauce if you use a large dish. Turn potatoes in microwave every 10 minutes for about 1/2 hour or until done. Stir if edges are done and center isn't. (I had to stir from the first time I turned the bowl.) Put Cheddar cheese on top the last few minutes. Put into large Corning Ware dish or glass dish with cover.