Yum, I love roast chicken!
You can roast a chicken without adding any fat if you make a marinade of yoghurt, tomato, lemon and garlic and baste it regularly.
You can also make roast root veg (squash, sweet potato, swede, carrot) without adding any oil: chop the veg up into thumb-sized chunks, put in a baking tray, cover with chicken stock and roast in the same oven as the chicken. It takes about 20 minutes, and the veg will come out exactly as when you roast it in tons of oil! It becomes all caramelised and crunchy on the outside, and creamy on the inside, as all the liquid evaporates.
Have a chicken breast (without the skin?) for your tea today, and then, as Annya suggested, use the rest of the meat to make a saucy dish and the carcass to make soup.
Hm, maybe I'll pop out and buy a chicken, you've made me want one!
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