Make an envelope out of 2 pieces of foil - I lay them on top of each other, fold it in half then turn in 2 edges and leave the top open. Then for JJ I put a couple of mini fillets of slice up a normal breast, a squeeze of lemon, a tomato quartered or a few cherry one and some herbs if there are any kicking about - you could use anything really. Fold down the last egde of the foil, put it in a baking tray and in a hot oven (220c) for about 20-25 mins. It is good for JJ as it stays really nice and soft and juicy and full of flavour.
For adults it is nice with white wine, bacon, mushrooms etc put in the bag.