Mix finely crushed cookie crumbs with melted butter. Press into the bottom of a 13 x 9-inch pan. Refrigerate until firm, about 1 hour.
Beat softened cream cheese until smooth. Add the sugar and vanilla; beat well.
Fold in whipped topping and coarsely chopped chocolate sandwich cookies.
Spread cream cheese mixture on top of crumbs.
Chill for at least 4 hours before serving.
Top with additional coarsely chopped cookies if desired.