Preheat the oven to 425°F. Rub the potatoes with olive oil, sprinkle them with salt and pepper, and prick them with the tines of a fork. You can lay them directly on the oven rack or place them on a baking sheet. Cook the potatoes for 45 to 60 minutes, until their skin is crispy, and sticking one with a fork meets no resistance.
Scooping out the fluffy middle of a just-baked potato and mashing it up with a little butter and a couple of tasty extras before popping it back in the oven is a great way to make a jacket spud extra appealing. This spicy, mushroomy filling is delicious; there are a couple of alternatives too.