Wash the apricots, halve them and remove the stone. Cut the fruit into slices. Mix maple syrup and liqueur. Put the apricots in a bowl, pour the syrup-liqueur mixture over them and let them steep for about 15 minutes.
In the meantime, separate the eggs. Whisk the egg yolks, sugar and vanillin sugar with the whisk of the hand mixer until thick and creamy white. Stir in curd and cream. Beat the egg whites until stiff and fold into the quark mixture in portions.
Place the apricots and marinade in 4 ovenproof greased casseroles. Sprinkle with brown sugar, spread the quark mixture evenly over it and sprinkle with almond flakes. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for 18-20 minutes.
Remove from the oven, decorate with mint as desired and serve dusted with icing sugar.