Slow Cooker Scalloped Potatoes and Ham

to 4 lbs Yukon Gold Potatoes (peeled and thinly sliced)

large white onion (peeled and thinly sliced)

flour

cooked ham (coarsely diced)

cheddar cheese (shredded)

cream cheese (in small chunks)

family size can cream of mushroom soup

milk

kosher salt and black pepper

Italian parsley for garnish (optional)