Combine the 1 1/2 cups of crushed Oreos and melted butter. Press the mixture firmly into the bottom and up the sides of a 9-inch pie plate. Chill the crust for 15 minutes.
In a large bowl, beat the softened cream cheese, powdered sugar, and vanilla extract until smooth.
In a separate bowl, whip the heavy cream and granulated sugar until stiff peaks form.
Gently fold the whipped cream into the cream cheese mixture until just combined.
Fold in half of the thawed whipped topping until no streaks remain. Spread this filling evenly into the chilled crust.
Top the pie with the remaining whipped topping. Sprinkle the remaining 1 cup of crushed Oreos over the top.
Chill the pie for at least 4 hours, or until firm, before slicing and serving.
Notes
Use a food processor to crush the cookies quickly for the crust.
If you do not have heavy cream, you can substitute with 1 1/2 cups of cold milk mixed with 1 tablespoon of cornstarch, cooked until thick, cooled, and then folded into the cream cheese mixture.
You can use store-bought Oreo crusts to save time.