Mix the quark, mascarpone, sugar and vanilla sugar together well in a bowl. Whip the cremefine or cream until stiff and fold in. Season apple compote with cinnamon to taste and heat.
Pour the apple compote warm, but not too hot, into dessert glasses. Spread the walnuts on the compote and top with the cream.
Garnish with hazelnut brittle and cinnamon. Serve immediately.