Low GI cheesecake

Is such a thing possible? Indeed it is, and very delicious it is too. I made this up last year for my brother's birthday. He isn't bothered by low GI, but I was going to the party and wanted to partake of cake! So I invented this, and repeated it for Christmas dinner for my also sugar-free mum and partner. And reprised it again for Sam's birthday this year.

It all varies according to what I have, what I find and what I fancy at the moment.

Base: basically a flapjack recipe with unsalted organic butter and either oats or muesli, sweetened with maple syrup. Lots of butter is essential to make it stick together. This is baked in the oven til crisp - in a round, loose bottomed cake tin.
Cheese: This time I used half mascarpone and half greek yoghurt. Sometimes I use cream. I tend to stick with the sweeter and less cheesy things, then less sweetening is needed. Again, a large dollop of maple syrup and some vanilla pod. I scraped out the seeds from about an inch of pod. More wouldn't hurt.
Topping: traditionally I use blueberries as Sam loves them, but it's equally nice with raspberries or whatever soft fruit is in season (not a lot most of the year). I wouldn't normally buy fruit with massive air miles like blueberries, but it was a birthday treat. I always look out for fruit that is packaged in cardboard and not plastic. I often pay more just to avoid plastic packaging, and try not to buy too much out of season fruit. Though I lapse in winter of course and buy apples and oranges.