1-1 1/2 teaspoons kosher salt (1/4 teaspoon per potato)
chopped green onions
Scrub potatoes and let dry completely. Tear off a piece of aluminum foil large enough to wrap around each potato completely. Prick potatoes with a fork, then place in the center of the foil. Drizzle with 1/2 tsp olive oil and sprinkle with 1/4 teaspoon kosher salt. Rub the salt and oil over the surface of the potato, then wrap tightly with the foil sheet. Place in your slow cooker.
Cook the potatoes on high for 4 to 5 hours or low for 8 to 10 hours, until soft. Do not over cook, or the potatoes may become soggy. Remove and carefully unwrap (the potatoes will be hot). Split and top with cheese, green onions, bacon, and sour cream as desired.