Prepare a batch of dairy free cheese sauce or open a can or cheese soup. Then set aside.
Into the crock pot add half the potatoes and half of the onions. Then top those with half of the ham.
Sprinkle the first layer with half the parsley and pepper.
Then add the second half of the potatoes and onions followed by the rest of the ham. Then sprinkle with the rest of the pepper and parsley.
Add the dairy free cheese sauce on top. If it turned out a little thick add a little water to thin it. If using the canned cheese soup add some water to thin it just a little. You want more of a thick sauce instead of cheese sauce you could spread with a knife.
Set the slow cooker to low and let cook 6-8 hours until the potatoes are done.
I sometimes will sprinkle the dish with a little toasted breadcrumbs mixed with parsley but this is optional.