Line a deep 9 inch / 22cm square pan with parchment paper.
Place the Nutella in a small bowl (bain-marie method), place the bowl on a small pot with some water (do not let the water touch the bowl with Nutella) place on medium heat to boil, continue on a soft boil for approximately 10 minutes or until the Nutella becomes quite thin.
Remove the Nutella from the heat and mix with the cookie crumbs, place on the bottom of the baking pan, press down firmly, refrigerate. Continue with the White Chocolate Filling while the crust is in the fridge.
Melt the white chocolate the same way you melted the Nutella, the only difference is let the white chocolate cool (not cold)
In a medium bowl whip the cream until stiff.
In a medium bowl beat together cream cheese, sugar and cooled white chocolate, fold in the whipped cream.
Remove the crumb crust from fridge, spread the cream cheese mixture evenly on top.
Melt the dark chocolate the same as the Nutella. Let cool (not cold).
Drizzle the cool dark chocolate over the filling and swirl with the tip of a knife.
Refrigerate for approximately 5-6 hours or over-night. Enjoy!
Notes
Bain-marie is basically a fancy french term for a hot water bath. To do this, place a pot with water on the burner and a plate on top with the ingredient that needs to be melted or heated. If you are melted chocolate be sure that the water in the pot does not touch the bottom of the dish. Heat the water to a slow boil and stir the chocolate until completely melted and smooth.I always reach for digestive cookies and use my blender to make crumbs. Of course you can use graham cracker crumbs if you wish. The Italian likes lady finger crumbs also! Or how about using a chocolate wafer if you adore chocolate?Wrap the cheesecake bars tightly with plastic wrap or aluminum foil, individually or in the pan. Or you can place them in an airtight container. The bars should be stored in the refrigerator they will keep for up to 4-5 days in the fridge.They can also be frozen, either wrapped in plastic wrap or foil then placed in a freezer bag individually or altogether, if placing in a container then separate the layers with parchment paper. They will keep for up to three months in the freezer.