Gizzi Erskine's potato skins

Heat the oven to 180ºC. Bake the potatoes until tender, about 45 mins. Cool and cut each potato into 4 wedges. Scoop out most of the cooked potato (keep and use for mash or fishcakes - you can freeze it), leaving a shell of potato and skin about 8mm thick. Spritz with oil on both sides and season. Put on a baking tray, set on top of an oven tray. Bake for 30 mins or until crisp and golden.