Knead the flour, sugar, vanilla sugar, butter and egg into a simple shortcrust pastry, roll out thinly on a baking sheet. Prick the rolled out dough several times with a fork.
Make crumbles from the remaining flour, sugar, butter, nuts and cinnamon. Do not spread the jam too thickly on the base and cover with the sprinkles.
Bake the whole thing in a preheated oven at approx. 200 ° C for about 15 minutes and let it brown slightly. Check after 10 minutes to ensure that nothing is too dark. Cut into strips while hot and leave to cool on a wire rack.