Step 1: Prepare the Oreo Crust

1. Preheat your oven to 325°F (163°C) and grease a 9-inch springform pan.

2. Crush the Oreo cookies into fine crumbs using a food processor or by placing them in a plastic bag and crushing them with a rolling pin.

3. Mix the Oreo crumbs with melted butter until the mixture looks like wet sand.

4. Press the mixture firmly into the bottom of the springform pan to create a solid base. Use the back of a spoon or a flat-bottomed cup to evenly compact the crust.

5. Bake for 8-10 minutes, then remove from the oven and let it cool while you prepare the filling.

Step 2: Make the Nutella Cheesecake Filling

1. In a large mixing bowl, beat the softened cream cheese and sugar on medium speed until smooth and creamy (about 2 minutes).

2. Add Nutella, sour cream, vanilla extract, and salt. Mix until fully incorporated. Scrape down the sides of the bowl to ensure everything is well blended.

3. Add the eggs one at a time, beating on low speed after each addition. Do not overmix—just blend until combined. Overmixing can introduce air bubbles, which may cause cracks during baking.

Step 3: Bake the Cheesecake

1. Pour the cheesecake batter over the cooled Oreo crust, smoothing out the top with a spatula.

2. Bake at 325°F (163°C) for 50-55 minutes. The edges should be set, but the center should still have a slight jiggle.

3. Turn off the oven and leave the cheesecake inside with the door slightly open for about 1 hour to cool gradually. This helps prevent cracks.

4. Once cooled, transfer the cheesecake to the refrigerator and chill for at least 4 hours, preferably overnight.

Step 4: Add the Nutella Topping (Optional but Delicious!)

1. Warm ½ cup of Nutella in the microwave for about 15 seconds to soften it slightly.

2. Pour the warmed Nutella over the chilled cheesecake and spread evenly with a spatula.

3. Top with whipped cream, chopped hazelnuts, or chocolate shavings for extra flavor and texture.

Step 5: Slice and Serve

1. For clean slices, dip a sharp knife in warm water and wipe it clean between each cut.

2. Serve and enjoy the rich, chocolatey, hazelnut-infused goodness!