Separate the eggs, beat the egg whites into snow. Mix the egg yolks with the oil, sugar, flour, baking powder, milk, vanilla sugar, rum aroma and cocoa powder to a frothy batter. Stir in the melted chocolate and finally fold in the egg whites.
Place the dough on a deep, greased baking sheet and bake in a preheated oven at 170 ° for about 40-50 minutes, depending on the height and size of the sheet. (Carry out a stick test after 40 minutes. If the dough does not stick, the cake is good.)
Let cool down.
Variant:
Add a handful of grated hazelnuts or walnuts to the batter.
Tip:
Dust with powdered sugar or cover with chocolate icing.