Prepare the Crust : Crush the Oreos into fine crumbs using a food processor or blender. Mix with melted butter until well combined. Press firmly into the bottom of a greased springform pan and chill in the refrigerator for at least 30 minutes.
Make the Filling : In a large mixing bowl, beat the softened cream cheese until smooth. Gradually add sugar and mix until fully incorporated. Add sour cream, vanilla extract, and eggs one at a time, ensuring each ingredient is mixed thoroughly before adding the next.
Assemble the Cheesecake : Pour the cheesecake batter over the chilled crust. Smooth the top with a spatula.
Bake : Preheat your oven to 160°C (fan-assisted) or 180°C (conventional). Bake for 50 minutes or until the edges are set but the center still jiggles slightly.
Cool and Chill : Allow the cheesecake to cool completely at room temperature, then refrigerate for at least 4 hours or overnight before slicing.
Serve : Garnish with whipped cream, extra crushed Oreos, or fresh fruit if desired.