For the Kernöl-Gugelhupf, beat egg whites with granulated sugar until stiff. Whisk yolks, powdered sugar, vanilla sugar with water until foamy.
Slowly add kernel oil and continue to stir. Slowly stir in flour, yogurt and beaten egg whites.
In a greased and with pumpkin seeds covered Gugelhupfform the core oil Gugelhupf approx. 50 minutes with 180 degrees bake.