Separate the eggs, mix the yolks with sugar and baking powder. Beat the egg whites until stiff, pull in the grated hazelnuts and mix everything together.
Grease the baking pan (only use a Rodon pan, ie the one with the oven pipe in the middle) well, sprinkle with breadcrumbs if necessary, pour in the dough and bake in the preheated oven at 175 ° C top / bottom heat for 50 - 60 minutes.