Remove the pan from the heat and add the sliced potatoes, drizzle with olive oil, and season with salt, pepper, and parmesan then toss together to evenly coat.
Roast the potatoes in the oven for 12-15 minutes then carefully remove the pan and toss the potatoes around then place back in the oven and roast for another 12-15 minutes, or until the potatoes are fork-tender.