01 -
Line the bottom of a 23 cm springform pan with parchment paper, leaving the excess hanging and secure with the ring.
02 -
In a large mixing bowl, combine graham cracker crumbs, crushed crisped rice cereal, chopped hazelnuts, and granulated sugar.
03 -
In a smaller bowl, blend softened butter and Nutella, microwave for 30–45 seconds, and whisk until smooth.
04 -
Pour the Nutella-butter mixture over the dry ingredients and mix until fully incorporated. Press the mixture evenly into the base and ¾ up the sides of the pan. Set aside.
05 -
Preheat oven to 175°C. Bring approximately 1 litre of water to a boil for the bain-marie.
06 -
In a food processor, combine cream cheese, sour cream, sugar, whipping cream, and vanilla. Process until completely smooth, scraping sides as necessary.
07 -
Add eggs all at once and blend until fully incorporated.
08 -
Add corn starch and process until just mixed.
09 -
Add Nutella and melted chocolate, blending until uniform and smooth.
10 -
Wrap the exterior of the prepared pan with aluminum foil to prevent water ingress. Place the pan inside a roasting pan.
11 -
Pour the cream cheese mixture over the crust. Spread evenly. Place roasting pan on oven middle rack and fill with boiling water until it reaches ¾ up the sides of the cake pan.
12 -
Bake at 175°C for 25 minutes. Reduce oven temperature to 120°C and continue baking for 75 minutes.
13 -
Switch off oven. Leave the door ajar about 2.5 cm and let the cake cool in the oven for 1 hour. Remove and allow to reach room temperature.
14 -
Run a thin spatula around the edge to loosen. Refrigerate uncovered for at least 6 hours, preferably overnight.
15 -
Combine chopped chocolate, Nutella, whipping cream, and butter in a microwave-safe bowl. Microwave for 1 minute, rest for 1 minute, then stir for 1 minute. Repeat until smooth, microwaving only 20 seconds if needed for final smoothing.
16 -
Reserve 1 cup of ganache. Refrigerate until thick enough to pipe, stirring occasionally (about 3 hours).
17 -
Stir chopped hazelnuts into remaining ganache. Pour over chilled cheesecake and spread evenly. Return to refrigerator until ganache is set.
18 -
Carefully remove the springform ring while leaving the base and parchment in place.
19 -
Transfer chilled reserved ganache to a piping bag fitted with a medium star tip. Pipe 12 swirls around the edge and 1 in the center.
20 -
Place a Ferrero Rocher chocolate on top of each ganache swirl.
21 -
If desired, melt leftover ganache, transfer to a parchment piping cone, and drizzle over each Ferrero Rocher.
22 -
Transfer the cake to a serving plate. Refrigerate until 1 hour before serving.