I used the quick oatmeal. I can't see why apple wouldn't work. I would be inclined to use olive oil. I stopped using canola a while back, couldn't stand the smell when it's cooking, switched to corn and no more smell but I wouldn't give it to Bayley. I don't think the oil is all that important. I don't use very much as I don't want greasy cookies. You could also use applesauce.
I've bought Northern Biscuits for Bayley but they've gotten too expensive but they've got alot of neat flavours. I'm thinking of doing some experimenting on flavours with fruit and stuff. I wouldn't mind getting into selling them, start my own little business