Beat the quark with cream cheese and yogurt in a large bowl with the mixer. Add sugar and vanilla sugar. Whip the cream until stiff and fold into the quark mixture. Finally fold in the drained mandarins and refrigerate the cream for at least 6 hours.
Melt the butter in a coated pan, add sugar and vanilla sugar and let it caramelize, always stirring so that the caramel does not turn dark and thus bitter. Add the almond flakes and let the caramel cover them. Put the mixture in a fine sieve, slightly cooled, so that the fat can drain off. Put in a cool place!
Just before serving, fill the quark dish into a decorative bowl and sprinkle with the almond brittle.
PS: You can prepare the quark dish well in the morning, then it is beautifully drawn through. It also tastes very good the next day.