Preheat the oven to 180 ° C. Grease a flat, square baking pan (for brownies) and line it with parchment paper.
Melt the chocolate and butter over a hot water bath and mix. Let cool down briefly, then stir in with the eggs. In another bowl, mix the flour, baking powder, powdered milk and sugar together. Then stir in the chocolate drops and macadamia nuts. Finally add the butter mixture and mix well again. Pour into the pan and bake for 25 minutes. Let cool and cut into cubes.