Roughly chop 300 g chocolate. Break remaining chocolate into pieces and melt with butter in hot water bath. Beat the eggs, 1 pinch of salt, brown and white sugar with the whisk of the mixer for 6-8 minutes until foamy.
Stir in the chocolate-butter mixture. Mix flour, cocoa and baking powder and stir in briefly. Add the chopped chocolate.
Line about three trays with baking paper. Cut out the dough with an ice-ball former, put 2 dough balls on top of each other and press them slightly flat. Place the portions on the baking tray with enough space between them, as they will run apart.
Bake one after the other in a preheated oven (electric oven: 175 °C/circulating air: 150 °C/gas: see manufacturer) for 10-12 minutes. Let them cool down.