I find if you boil them to the point they still have thier shape but too soft to cut into the chip shape, then drain, wack on the tray and pour frylight, season with pepper and wack in the oven high, they tend toc crisp really well, the more soft they are to begin with the better. (so i think anyways) as when you drain the 'chip' the side themselves, and arnt clean cut, if that makes any sence?