Marks frozen roasties are good, also the mcCain ones in the silver packet. I agree with what everyone has said about the slow cooker. On cold days though I use the oven as part of the house heating, put in a roasting tray fingers of parsnip, carrot, wedges of potato and chunks of skinless boneless chicken, onion if you like it, drizzle with oil then roast all together covered for about 40 mins at 180 ish. Take the lid or foil off for the last ten minutes. If you like them, toss in frozen chestnuts, instant roast dinner.