Wash and dry the potatoes
Pierce each potato several times with a fork
Rub the potatoes with a little oil if desired
Sprinkle with salt if desired
Wrap each potato in foil or leave unwrapped
Place potatoes in the crock pot
Cover and cook on low for 7 to 8 hours or on high for 4 to 5 hours
Check for doneness by piercing with a fork
Remove and serve hot