For a jacket potato recipe start with a large floury potato like Maris Piper or Russet. Scrub it, pat dry, prick several times, then rub with olive oil and coarse salt. Bake directly on the oven rack at 200 °C (400 °F) for 60–75 minutes until the skin is crisp and the inside fluffy. Split it open, fluff with a fork, and melt in butter. Season with salt and pepper. Add toppings such as cheese, beans, sour cream, chives, tuna mayo, or leftover chili. Finish under the grill for extra crispness and perfectly melted toppings.