Meanwhile, mix the eggs, sugar and salt together until the mixture is thick and yellow. Then add the flour and vanilla extract and keep stirring. Finally add the melted chocolate butter (it shouldn`t be too hot) and mix everything together well.
Pour the dough into the floured and buttered tins and bake in the preheated oven for 10 minutes at 200 ° C top / bottom heat.
Then let the cakes cool down briefly, turn them out of the mold, refine with powdered sugar and serve immediately.