Add peanut butter, powdered sugar, and vanilla extract; beat until silky and lump-free.
1 cup creamy peanut butter, 0.75 cup powdered sugar, 1 tsp vanilla extract
Whipped Cream Topping
Whip the heavy cream and powdered sugar until stiff peaks form.
1.5 cups heavy whipping cream
Gently fold the whipped cream into the peanut butter mixture to preserve its light texture.
Spoon the filling into the baked crust, smoothing the top with a spatula.
Refrigerate for at least 4 hours or until fully set.
Sprinkle with peanut butter chips just before serving.
2 tbsp powdered sugar
Notes
During development, chilling the pie overnight gave the crispiest crust and a clearer set.I found that gently folding the whipped cream into the filling preserved its airy texture instead of deflating.Leftover slices kept their shape and flavor beautifully for up to 3 days when stored tightly covered.