Preheat oven to 425°F (220°C)
Scrub potatoes clean under running water
Pat potatoes dry
Poke 6–8 holes in each potato with a fork
Rub potatoes with olive oil (optional)
Sprinkle with salt (optional)
Place potatoes directly on the oven rack or on a baking sheet
Bake 45–60 minutes for medium potatoes, or 60–75 minutes for large potatoes
Check doneness by inserting a knife into the thickest part (it should slide in easily)
Remove from oven
Let potatoes rest 5–10 minutes
Slice lengthwise and fluff the inside with a fork
Top with butter, sour cream, cheese, chives, or desired toppings