Mix the eggs, egg yolks and sugar (1) without beating until light and airy.
Carefully stir in the hazelnut powder, flour, vanilla powder and melted Brioche Butter.
Beat the egg whites with the sugar (2) until a smooth foam forms.
Combine with the batter and spread on a 60 x 40cm baking tray.
Bake at 160°C for around 20 minutes.
Let cool and cut out circles 18 cm in diameter.
Set aside for assembly.