Sorry mojay for having overlooked your question to me.
However, pastafreak I thank for having provided the answer which you require.
Actually, I only use the Slow Cooker for joints of meat. Nevertheless, I wouldn't be afraid to do what pasta has suggested, along with a tin of condensed mushroom soup poured over the onions and chops, together with a handful or so of frozen chopped mushrooms....Cooked on low for up to 5hrs should be ok.
My tummy is now rumbling at the thought of Pork chops served with an onion and mushroom sauce. (Or should I say 'Jus' which seems to be the in-word nowadays.)
Ron.