In a large mixing bowl, whip the heavy whipping cream, powdered sugar, and vanilla extract until stiff peaks form.
Gently fold in the Nutella until well combined.
In a rectangular or square dish, arrange a layer of ladyfingers at the bottom.
Spread half of the Nutella cream mixture over the ladyfingers.
Sprinkle half of the chopped hazelnuts over the cream layer.
Add another layer of ladyfingers on top of the hazelnuts.
Spread the remaining Nutella cream mixture evenly over the second layer of ladyfingers.
Top with the remaining chopped hazelnuts.
Drizzle chocolate hazelnut spread over the top.
Cover and refrigerate for at least 4 hours or overnight to set.
Before serving, dust the top with cocoa powder. Enjoy your dessert!