Coarsely chop the whole grain biscuits so that there are still small pieces. The best way to do this is to put the biscuits in a freezer bag and crumble them with a rolling pin.
Melt the butter and mix it with the cookie crumbs. Add some cinnamon. Fill a small glass one-third with the biscuit crumbs and smooth it out. Set aside a few crumbs for decoration.
Process low-fat quark, yoghurt, cream cheese, vanilla sugar and agave syrup or honey into a cream using a hand mixer. You can also use sugar instead of agave syrup or honey. Spread the cream on the biscuit crumbs and smooth it out.
Finally, distribute the blueberries on the quark cream and decorate with the remaining biscuit crumbs.