Mix the sugar, vanilla sugar, oil, yolk, flour, baking powder and water until frothy. Beat the egg white and fold in. Spread the dough on a baking tray and bake until golden brown. 170 ° approx. 30 minutes.
Covering:
Pitted apples, cut into pieces, briefly boil with water and sugar and stir in pudding powder. Spread on the cooled sponge cake and chill.
Serve with whipped cream and cinnamon sugar as desired!