Preheat the oven to 425°F (220°C) and line a rimmed baking sheet with parchment paper or foil.
Wash the potatoes under cool running water, then scrub skins to remove dirt and soil. Pat the potatoes dry with a clean kitchen towel or a paper towel.
Rub each potato with olive oil or melted butter, then sprinkle their skin with salt.
Poke 3-4 holes in each potato with a fork.
Place potatoes on the prepared baking sheet.
Bake potatoes on the center rack of a preheated oven for 45 to 50 minutes. To test for doneness, insert a fork or knife into the thickest part; it should slide in easily when they are fully cooked.
Let the baked potatoes cool slightly, then split the tops open and serve with your favorite toppings.