Lightly grease an ovenproof casserole dish (one with a lid) with butter.
Heat the oil in a large frying pan, add the chicken and brown
over high heat for 10 mins.
Turn the heat down, add the garlic. Fry gently for 5 minutes,
add the olives and sage and heat gently for a couple of minutes;
then add the wine; season to taste, remove from the heat.
Transfer to the casserole pan, cover and cook in the oven for
50 mins maximum at moderate to high heat (Mk6 190 deg). Check regularly, turning chicken once after 30
mins.
Served with pasta or boiled rice, and you could try parsley
mashed potatoes too. For some variety, add a few shallots to the casserole.