Cut the potatoes in half or quarters and place in a bowl with the olive oil, salt, and pepper. If using, add garlic. Toss until the potatoes are well coated.
Transfer the potatoes to a sheet pan and spread out into 1 layer.
Roast in the oven for 45 minutes to 1 hour or until browned and crisp. Flip twice with a spatula during cooking in order to ensure even browning.