Preheat the oven at 175 degrees Celsius.
Start with the cake bottom. Butter a round baking form and sprinkle some flour evenly in the form.
Mix the eggs and the sugar very fluffy with an electrical mixer.
Add the flour, potato flour and baking powder and mix well. Pour the batter in the baking form.
Place the cake bottom in the lower part of the oven for 40 minutes. Take it out and let it cool down.
Divide the bottom in 3 layers.
Time to make the filling by prepare the vanilla cream according to the package. You can buy already prepared one at the store.
Whip the whip cream and vanilla sugar into a soft foam.
Mash gently the berries for the filling and mix it together with the whip cream.
Place the bottom of the cake on a serving plate. Spread evenly the vanilla cream on top. Put another layer of the cake on top. Spread evenly the Whip cream mixture on top. Place the top layer of the cake on top.
Time to prepare the topping by whip the whip cream and vanilla sugar to a hard foam. Cover the cake with a thin layer of cream both the top and the sides.
Place the berries on the top of the cake.
Place the rest of the whip cream in a piping bag and cover nicely the cake as you like.