For the crust: In a medium bowl, combine crushed graham crackers, melted butter, and sugar. Press mixture evenly into the bottom and up the sides of a 9-inch pie plate.
For the filling: In a large bowl, beat together creamy peanut butter and softened cream cheese until smooth. Gradually beat in powdered sugar and vanilla extract until well combined.
Gently fold in the thawed whipped topping until no streaks remain. Pour the filling into the prepared crust and spread evenly.
Cover the pie and refrigerate for at least 4 hours, or until firm. Before serving, drizzle with chocolate syrup and sprinkle with chopped peanuts, if desired.
Notes
This pie is best served chilled. It can be made a day in advance.