Banana and Chocolate Chip Bars

I made this yesterday afternoon with Ben after he had come home for school. It had been rather a hectic day, and I'm not sure what possessed me to bake again, but sometimes that happens. I always remember a teacher of mine saying "if you want something done, ask a busy person". When I was 16, I didn't really understand what she mean't- I do now!
Anyway, these were really easy, and quite fun to make. It is rather like flapjack, with a layer of banana in the middle. Mary describes them as a "really healthy snack". I'm not sure I would really agree, although I did use ordinary self raising flour rather than the suggested wholemeal, which I did not have in my vast store cupboard! Mary says to use a 7in square cake tin. I do not own one of these so used my 8in round sandwich tin. This seemed to work fine. If I were making it again, I think I would double the mixture and make it in a bigger tin. There is none left today, so that's always a good sign. We would give them 8.5
By the way, for those of you worried about the health of our family, we operate on the basis of "it is better to give than to recieve", so we hardly ever end up eating  all of what I bake - good job too!