Mix butter and sweetness until creamy. Stir in eggs, flour and baking powder. Spread the dough into a greased springform pan (24 cm Ø). Bake in a hot oven (electric range: 175 °C/circulating air: 150 °C/gas: level 2) for 20-25 minutes. Leave to cool in the mould
Drain the cherries, collect the juice. Boil up the juice with the spice bag and let it stand for about 5 minutes. Remove the bag. Mix starch with 3-4 tablespoons of water. Bind juice with it. Fold in cherries. Flavour with sweetener and cinnamon. Spread the cherries on the base, let cool down
Mix crème fraiche and quark. Flavour with sweetener and cinnamon. Spread on the cherries. Decorate the cake with cinnamon if desired