1. Crust: Mix crushed Oreo cookies with melted butter. Press into the bottom and up the sides of a 9-inch pie dish. Chill in the refrigerator for 30 minutes.
2. Filling: In a large bowl, beat together peanut butter, cream cheese, and powdered sugar until smooth and creamy. Gently fold in the whipped topping until well combined.
3. Spread half of the filling over the Oreo crust. Sprinkle half of the chopped peanut butter cups over the filling. Add the remaining filling on top and smooth with a spatula.
4. Topping: Sprinkle the remaining chopped peanut butter cups on top. Drizzle with chocolate syrup.
5. Chill the pie in the refrigerator for at least 2 hours before serving.
Enjoy your delicious Peanut Butter Cup Pie!