For the nut brownies, melt butter and chocolate together in a saucepan. Beat eggs and sugar until foamy. In a bowl, stir together flour, baking powder, almonds, the chocolate mixture and eggs. Finally, fold in the hazelnuts.
Pour the brownis mixture into a baking pan lined with baking paper (28cm diameter) or a square baking tray. Bake in a preheated oven at 180°C for 20 to 25 minutes. And the nut brownies are ready.