I'm addicted to fruit crumbles, so I'm going to have to experiment a bit with the crumble topping, to get rid of sugar and 'bad carbs'; I always put a quite a bit of oats in anyway to make it crunchy... I'm going to try a topping with butter, oats and oat meal, and chia and/or flax seeds with a little truvia (I used to use demerara sugar, or even soft brown, and might when my readings are down use the Tate & Lyle Truvia and Dem mix, of which I bought a packet last night).
I've usually added mixed spice or just cinnamon - or just nutmeg! - to the crumble topping, while putting a clove and a pinch of ginger in the fruit at the bottom. Mostly I put a couple of good spoonfuls of my homemade jam in the bottom of the bowl - I put very little sugar in my jams anyway, so they are more like a 'coulis', a bit runny, esp the wild plum (there are trees everywhere round here, inc small greengages, mirabelles etc - also wild cherry and of course blackberries). Then I put the apple or pear (or both) on top of the jam, then the spices, then the topping. No two are ever quite the same...
I hope I can get this to a stage I can still eat fruit crumbles!