Mix the hazelnuts, almonds, sugar, flour and cinnamon in a bowl. Melt the butter in a saucepan and add to the mixture. Mix the whole thing well. Then whip the egg whites firmly with a pinch of salt. Fold the egg whites into the mass.
Preheat the oven to 180 ° C fan oven. Place a small pile with a teaspoon on a baking sheet lined with baking paper. Make sure that there is enough space to the next place. Bake the cookies for 10-15 minutes depending on the degree of browning you want. After cooling, put a teaspoon of melted chocolate on each cookie.