Make the Crust:
Mix crushed biscuits, melted butter, and cocoa powder in a bowl until crumbly and evenly coated.
Press the mixture firmly into the base of an 8- or 9-inch springform pan.
Chill in the refrigerator while preparing the filling.
Prepare the Filling:
In a large mixing bowl, beat softened cream cheese and powdered sugar until smooth and fluffy.
Add Nutella, vanilla extract, and a pinch of salt. Beat again until silky and fully combined.
Whip the Cream:
In a separate bowl, whip the heavy cream until soft peaks form. Gently fold the whipped cream into the Nutella mixture until smooth and creamy — don’t overmix.
Assemble the Cheesecake:
Pour the filling over the chilled crust, smoothing the top with a spatula.
Cover the pan with plastic wrap and refrigerate for at least 6 hours, or preferably overnight, until firm.
Add the Topping:
Once the cheesecake is set, remove it carefully from the springform pan.
Spread melted Nutella on top and decorate with toasted hazelnuts and chocolate curls.
Serve:
Slice with a warm knife and serve chilled. Each bite is smooth, rich, and irresistibly creamy!