Beat eggs, sugar and vanilla sugar until frothy. Mix the flour and baking powder and stir in. Pour in the oil and Fanta and stir in as well.
Grease a baking sheet and spread the dough on it smoothly. Bake for 25 minutes at 150 ° C.
Let the cake cool down.
Drain the mandarins. Whip the cream until stiff, pour in 3 sachets of vanilla sugar and cream stiffener.
Mix the sour cream with 2 sachets of vanilla sugar. Fold in the mandarins and fold in the cream loosely. Spread the cream evenly on the cake. Put it in the fridge until the sour cream and tangerine mixture is firm. Sprinkle with cinnamon sugar if you like.