I like this one because it's SUPER easy and cheap. Throw a liner into the crock pot and clean up is easy too!
3-1/2 inch think slices deli ham (or more, if you have a hungry family)
7 medium potatos, sliced
1 small onion, sliced
1-2 cups grated cheddar cheese
1 can cream of mushroom soup
salt and pepper, to taste
Put half of ham, potatoes and onion in crock pot.
Sprinkle with salt and pepper, then add grated cheese.
Repeat with remaining half.
Spoon undiluted soup over top.
Cover and cook on low for 8-10 hours or on high for 4-5 hours.