In a mixing bowl, add the soya double cream alternative and whip it until stiff peaks form.
Gradually add the cream cheese, icing sugar, vanilla extract and cocoa powder to the cream and beat until well combined.
Melt the dark chocolate in a microwave-safe bowl or over a double boiler. Once melted, add it to the cream cheese mixture and mix until well combined.
Pour the cheesecake mixture over the prepared crust and spread it out evenly.
Decorate the top using crushed roasted hazelnuts and vegan chocolate hazelnut balls.
Refrigerate the cheesecake for at least 4 hours or until fully set before serving.