Mix the baking mix, eggs, 100 ml water and oil to a smooth dough. Chop nuts and trail mix, stir in. Spread the dough on a greased baking tray. Bake in the preheated oven (electric oven: 175 °C/ gas: level 2) for approx. 40 minutes. Let it cool down. Cut lozenges of about 6 x 6 cm.
Coarsely chop the chocolate coating. Melt white and dark chocolate separately in a water bath. Cover the lozenges with dark chocolate coating and let them dry. Pour white couverture into a freezer bag and cut off a small corner. Spray clefs or similar onto the rhombs as desired. Serve dusted with icing sugar