Heat oven to 350 degrees. Wash potatoes thoroughly with a stiff brush and cold running water. Dry, then using a standard fork poke 8 to 12 deep holes all over the potatoes. Place in a bowl and coat lightly with oil. Sprinkle with salt Place potatoes directly on top rack in middle of oven. Place a baking sheet on the lower rack to catch any drippings. Bake 1 hour or until skin feels crisp and inside feels soft. NOTE: If you're cooking more than 4 potatoes, you'll need to extend the cooking time by up to 15 minutes.