Put 125 g quark, oil, egg, diabetic sweetener, salt and flavour in a bowl. Mix flour and baking powder and sieve over it. Knead everything into a smooth dough. Grease the cake tin (approx. 10 cm Ø). Roll out the dough on a little flour and cut out circles (approx. 11 cm Ø).
Line the moulds with the dough. Spread the dough with condensed milk. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes. Whip cream until stiff. Season 375 g quark with sweetener. Fold in cream. Spread the cream over the cakelets. Quarter the strawberries and cover the cream with them. Finely chop the chocolate and sprinkle over the cakelets.
Season 375 g quark with sweetener. Fold in cream. Spread the cream over the cakelets. Quarter the strawberries and cover the cream with them. Finely chop the chocolate and sprinkle over the cakelets. Decorate with mint if desired.