Make the crust: Crush the Oreos (filling included) into fine crumbs using a food processor. Mix with melted butter until well combined.
Press the mixture firmly into the bottom of a 9-inch springform pan. Chill in the fridge while you prepare the filling.
Make the filling: Beat the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy.
In a separate bowl, whip the cold heavy cream to stiff peaks.
Gently fold the whipped cream into the cream cheese mixture until combined.
Fold in the crushed Oreos.
Spread the filling evenly over the chilled crust. Smooth the top.
Cover and refrigerate for at least 6 hours (overnight is best).
Before serving, garnish with whipped cream and extra crushed Oreos if desired.