Crush the Oreos finely and mix with melted butter until moistened. Press into the bottom of a springform pan and chill for 30 minutes.
Beat softened cream cheese with sugar and vanilla until smooth. Whip heavy cream with powdered sugar until stiff peaks form, then gently fold into the cream cheese mixture.
Pour the filling over the chilled crust, sprinkle reserved crushed Oreos on top, and refrigerate for at least 4 hours or overnight.
Once set, slice and serve garnished with additional toppings if desired.