Scrub potatoes under water and dry them off. --Spray or rub potatoes with oil. --Use a metal fork to poke a few holes in each potato. --Put potatoes on a rimmed baking sheet, and bake at 400 degrees for 50-60 minutes, until soft. --If baking potatoes ahead for a party, the hot, baked potatoes can be stored in a cooler for up to 4 hours. Preheat the cooler with hot water before hand; empty and dry it right before adding the hot potatoes.