Stir yeast and 1 tbsp. sugar until the yeast becomes liquid. Warm the cream until lukewarm. Mix flour, 60 g sugar, 1 packet vanillin sugar and salt in a bowl. Add egg, yeast and lukewarm cream and mix with a mixing spoon. Then place the dough on a floured work surface and knead well. Put the dough back into the floured bowl, cover and leave to rise in a warm place for 30-40 minutes
Mix brown sugar and 1 packet of vanillin sugar Grease a fat pan (approx. 32 x 39 cm) and dust with flour. Roll out the dough in the fat pan and let it rise in a warm place for 20-30 minutes Press flat depressions into the dough with your fingers. Mix jam and rum and put it into the depressions as a blob. Spread soft flakes of butter in between. Sprinkle hazelnut leaves and brown sugar in between as well
Bake in the preheated oven, 2nd shelf from below (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) for 18-20 minutes. Let the butter cake cool down on the fat pan, then cut into pieces
Waiting time approx. 50 minutes