Beat the butter, sugar and eggs until frothy. Mix flour, baking powder, sieve and add to the dough alternately with milk. Cut a bar of children`s chocolate into small pieces and fold into the batter. Divide the batter into baking molds. Bake the tartlets at 200 ° (preheated) for about 20-30 minutes.
Melt the second bar of children`s chocolate and spread it on the muffins as a glaze!