Spray the inside of your slow cooker with non-stick cooking spray. Clean potatoes really well, rub with olive oil and then coat with kosher salt. Place in slow cooker. Cook on high for about 4-6 hours. Rotate them occasionally so that each side has a chance to touch the cooker (helps with even cooking).I made a baked potato bar for supper. I set out all sorts of toppings and everyone made their own. Super easy supper!