Get a good, sturdy, non stick tin
As with Yorkshire puddings a hot tin and hot oil makes all the difference. I normally put enough olive oil in the tin to coat the bottom well then sick it in the bottom of the oven to heat up before pealing the potatoes.
Peal your potatoes and Boil them for about 10 mins in lightly salted water. If you prod the potatoes with a knife you should feel slight resistance but the potatoes should not be cooked right through.
Once the potatoes are done, drain the water and give the strainer a slight shake so the out side of the potatoes goes a bit fluffy.
Take the heated tin /oil out of the oven. Put the drained potatoes in the tin and sprinkle lightly with salt, then turn the potatoes over so they are coated in oil and lightly salt the other side.
Then put the potatoes in the oven for about an hour and a half.
When done the potatoes should be a light golden brown.
Turning the potatoes? You can just put the potatoes in the oven and leave them – this will result in a crunchy bit on the bottom – If you want an even outside turn the potatoes once or twice during the cooking.