How to make
Heat the butter and mix it with the flour, sugar, baking powder, vanilla and eggs. Beat the mixture with a mixer, then put the hazelnuts in it.
Distribute the mixture into a cake form that you've buttered ahead of time and covered with baking paper. Bake the cake for about 40 min. at 360°F (180 °C).
Separately, beat the cream for the cake with the milk and powdered sugar with a mixer. Cut the ready cake layer into 2 and place one half in a platter. Smear it with half the cream you made and distribute 1/3 of the fruits on top. Place the 2nd half of cake layer on top.
Spray rosettes on it with some of the cream and smear on the rest. Decorate with the rest of the raspberries and blueberries. Leave the cake in the fridge for a few hours.