mix the pears, walnuts and the brown sugar in an oven pan, set aside
mix the flour with the butter and the sugar, since this is low calorie, I used less butter so you need to kneed it a bit longer to combine all of these three ingredients. But you won´t taste it, promise
spread the crumble over the pears and put in the oven for about 20 minutes.
in this time mix the ingredients for the cream, that´s all you need to do here :-)