Place the potatoes in a large pot and fill with water. Season generously then place on high heat and boil until a sharp knife can easily be inserted into the potatoes
In the meantime, pre-heat the oven to 230ºC/450°F.
When the potatoes are cooked, drain and place them on a greased rimmed baking sheet. Gently push down on the potatoes with a potato masher or wooden spoon until they are flattened.
Drizzle over the olive oil and season generously with salt and pepper, adding a sprig of thyme to each potato.
Place in the oven and allow to roast for 30-40 minutes or until the potatoes are golden brown and crisp.