Preheat the oven to 450°F. Position a rack in the upper third of the oven.
Place in a large saucepan or pot:
Fill the pot with cool water to cover the potatoes. Bring to a boil over high heat, then reduce the heat to medium-low, cover, and simmer until the potatoes are just tender, 15 to 20 minutes. Drain the potatoes well in a colander, then transfer to a large bowl. Add:
Toss the potatoes well to coat with the oil and seasonings. The potatoes will start to disintegrate around the edges—this is okay. Transfer the potatoes to a large baking sheet and spread out in a single layer. Roast, undisturbed, for 20 minutes. Use a metal spatula to turn the potatoes, then return to the oven until deeply browned and crispy, about 20 minutes more.