1. Preheat the oven to 350°F with a rack in the middle and lower position. Wash potatoes with a stiff brush, removing any excess dirt and pat dry. Using a fork poke the potatoes 8-12 times going 1-inch deep all over the potato. Brush potatoes lightly all over with the oil.
2. Place the potatoes directly on the middle oven rack. Place a sheet pan on the lower rack to catch any liquid that drips out of the potatoes.
3. Bake for 1 hour or until potatoes are tender when pierced with a knife. Transfer to a cutting board and cool for 5 minutes.
4. To serve, cut from end to end and then squeeze one end towards the other. Top with butter, salt and pepper.

Notes