In a large bowl, combine the meatloaf ingredients, you will have mix this with clean hands, be careful not to over mix.
Shape the meatloaf on one side of the slow cooker, I tried to keep the meatloaf from touching the sides.
Make a foil "bowl" out of a foot or so of foil. Shape it next to the meatloaf. Add the potatoes and onions. Season the potatoes and onions with the salt, pepper, and onion powder, and toss them with your clean hands. Drizzle over the melted butter.
Cover and cook on LOW for 5 hours. DO NOT OPEN THE LID WHILE THIS IS COOKING, or the potatoes will not get tender.
After the cooking time is up add the cheese on top of the potatoes, and cover for about 5 minutes more or until the cheese is melted. Add ketchup to the top of the meatloaf and serve.
Enjoy!