Remove and uncover the wrap. Drain and cool the potatoes until just warm. Pour the oil onto a large rimmed baking sheet and sprinkle the oil with 3/4 teaspoon of the salt and 1/2 teaspoon of the pepper.
Put the baking sheet on the floor of the oven (bottom part and not on the rack) and roast until the undersides are crispy but not burnt, about 12-15 minutes. Remove the baking sheet from the oven and use a flat spatula or turner to flip the potatoes.