Roughly chop the chocolate coating. Melt with 200 g butter in pieces in a warm water bath.
Coarsely chop the dark chocolate. Let the cherries thaw a little in the sieve. Mix sugar, eggs and 1 pinch of salt with the whisk of the mixer for 3-4 minutes until creamy. Remove the chocolate-coating-butter mixture from the stove and stir in.
Mix flour and baking powder. Add chopped chocolate to the egg mixture.
Pour the dough into a greased square springform pan (24 x 24 cm; alternatively round, 26 cm Ø) and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for approx. 25 minutes.
Remove the mould carefully from the oven after about 10 minutes. Spread the cherries on top and bake until done. Let it cool down. Dust with icing sugar.