Preheat oven to 425°F (220°C). Place a large roasting pan in the oven with the oil to heat.
Peel or scrub potatoes and cut into even-sized chunks.
Add potatoes to a pot of salted water. Bring to a boil and parboil for 8–10 minutes until edges are tender.
Drain well and shake the potatoes to rough up the edges.
Carefully add potatoes to the hot oil, tossing to coat evenly.
Spread potatoes in a single layer and season with salt and pepper.
Roast for 45–50 minutes, turning once halfway through, until golden and crispy.
Add optional garlic or herbs during the last 10 minutes if desired.
Serve hot.