Adjust the oven rack to the lowest position in the oven. Preheat oven to 450°F.
Cut the potatoes lengthwise into eights to form wedges. Toss the potatoes with the oil on a heavy baking sheet or jelly-roll pan, and arrange them flat in a single layer.
Bake the potatoes without turning, until the bottoms are golden and crisp, about 20 minutes; turn potatoes to the other side. Bake 10 minutes more until crisp. Remove from the oven and sprinkle with salt and pepper.