For the dough, whisk the eggs, sugar, vanilla sugar and salt until white and creamy. Stir in sour cream. Mix flour and baking powder and stir into the egg-sand mixture. Put the dough on a greased fat pan (38x34 cm) and smooth it down. Bake in a preheated oven (electric: 175 °C/ gas: level: 2) for about 15 minutes. In the meantime, melt butter for the almond paste in a small pan, stir in sugar and vanillin sugar.
Add milk and mix in the almonds. Remove from the heat and carefully spread on the pre-baked cake. Bake the cake for another 12 minutes at the same temperature. Remove from the oven and allow to cool. Serve with whipped cream to taste