Step 1: Prepare the Crust

1. Crush the Oreos into fine crumbs using a food processor or rolling pin.
2. Mix the crumbs with melted butter until evenly combined.
3. Press the mixture firmly into the base of an 8-inch springform pan. Chill in the fridge while making the filling.

Step 2: Make the Cheesecake Filling

1. In a small bowl, sprinkle gelatin over cold water and let it bloom for 5 minutes. Microwave for 10 seconds to dissolve.
2. Beat the softened cream cheese and powdered sugar until smooth and creamy.
3. Add Nutella and mix until fully combined.
4. Stir in the dissolved gelatin, mixing well.
5. Gently fold in whipped cream until fully incorporated.
6. Pour the mixture over the chilled crust and smooth the top. Refrigerate for at least 4 hours, preferably overnight.

Step 3: Prepare the Ganache & Toppings

1. Heat the heavy cream in a microwave-safe bowl until warm (not boiling).
2. Add Nutella and chocolate chips, stirring until smooth. Let it cool slightly.
3. Pour the ganache over the chilled cheesecake, spreading evenly.
4. Garnish with chopped hazelnuts and whipped cream.

Step 4: Serve & Enjoy!

1. Carefully remove the cheesecake from the pan.
2. Slice using a warm knife for clean cuts.
3. Serve chilled and enjoy!