In a slow cooker, blend together the shredded frozen potatoes, diced ham, condensed onion soup, sour cream, and dry onion soup mix until the mixture is fully incorporated.
Distribute the grated cheddar evenly over the potato and ham mixture.
Spread the herb-seasoned stuffing mix across the surface, covering the cheese layer completely.
Carefully drizzle the melted butter over the top of the stuffing to moisten it.
Cover the crockpot with its lid and set it to cook on the high setting for four hours.
Once the cooking time is complete, remove the lid and serve the casserole warm.