Preheat oven to 425°F. In a large roasting pan, toss potatoes with olive oil, canola oil and thyme then spread out in a single layer. Roast, stirring every 10 minutes or so, until potatoes are crispy, browned and tender, about 1 1/4 hours.Transfer potatoes to a serving dish, sprinkle with salt and pepper and serve.n a large roasting pan, toss potatoes with olive oil, canola oil and thyme then spread out in a single layer. Roast, stirring every 10 minutes or so, until potatoes are crispy, browned and tender, about 1 1/4 hours. Transfer potatoes to a serving dish, sprinkle with salt and pepper and serve.