Beat cream cheese, peanut butter, and vanilla until smooth and fluffy.
Gradually mix in powdered sugar until creamy with no lumps.
Fold in the whipped topping gently to keep the mixture light.
Stir in most chopped candy, saving a handful for garnish.
Spread filling into the graham crust and smooth the top.
Sprinkle remaining candy over the pie and drizzle with chocolate syrup.
Chill until set, at least 3 hours, then slice and serve.