Preheat the oven to 425 degrees F.
Wash the potatoes well and pat dry. Poke holes all around each potato using a fork.
Rub the potatoes all over with oil, then sprinkle liberally with salt and pepper. Place the potatoes on a baking sheet or aluminum foil and roast until tender when pierced with a fork, 40 to 45 minutes.
Transfer the potatoes to a plate and serve with shaved Parmesan and a drizzle of olive oil.