Preheat oven to 425°F (220°C)
Scrub potatoes clean and dry them
Poke each potato several times with a fork
Rub potatoes with oil (optional)
Sprinkle with salt (optional)
Place potatoes directly on the oven rack or on a baking sheet
Bake for 45–60 minutes (depending on size), until skins are crisp and centers are tender
Flip potatoes halfway through (optional)
Check doneness by inserting a knife or fork into the center; it should slide in easily
Remove from oven and let rest 5 minutes
Cut a slit lengthwise down the center and gently squeeze ends to fluff
Add desired toppings (butter, sour cream, cheese, chives, bacon, etc.)