Beat the whipped cream firmly. Stir in the mascarpone, curd cheese, sugar and vanilla sugar.
Spread cream on the bottom in a rectangular shape, put a layer of speculoos and press into the cream, spread a layer of berries over it, cream, speculoos (press something into the cream again) the last layer should be cream, this one with cocoa powder sprinkle.
Chill for a couple of hours. The speculoos will be soft.