Hobo Casserole

1 lb lean ground beef
1 small onion
2 medium potatoes, sliced
4 slices American cheese
1 (10 3/4 ounce) can cream of mushroom soup
1/8 cup milk
1 1/2 cups French-fried onions
salt and pepper, to taste
Preheat oven to 350°F.
Pat ground beef into 8×8 pan and sprinkle with salt and pepper.
If using, slice onion on top of beef.
Slice potatoes onto onion layer, salt and pepper.
Layer with cheese slices.
Mix soup and milk together and spread over cheese.
Cover with aluminum foil and bake for 1 to 1 1/2 hours or until potatoes are tender.
Remove foil and top with french fried onions and brown for about 5 minutes