Shortbread Strip

Cream the butter with sugar and vanilla sugar until you get a light, fluffy, pale mixture.

Add the egg and egg yolk, then beat again until smooth and combined.

Mix in the flour and baking powder, then bring everything together into a soft dough.

Wrap it in plastic and let it rest in the fridge for about 20-30 minutes.

Roll out the dough into a thin sheet about 0.5 cm thick and bake in a preheated 180°C oven for around 20-25 minutes.

Once baked, split the cake layer in half, trim any rough edges, and spread apple jam between the layers.

Crumble up the trimmings into fine crumbs and sprinkle them over the top of the pastry.