Drain the peaches, cut them into small pieces and puree 1/4 of them. Whip the cream until stiff. Grate the chocolate. Whip the quark with sweetener and possibly milk until creamy, then fold in the remaining peaches and the stiff cream. Fill the quark into bowls and put a dollop of peach puree on top and sprinkle with chocolate sprinkles. Chill until ready to eat.