Prepare Peanut Butter Filling: In a large mixing bowl, beat together the peanut butter, powdered sugar, and softened cream cheese until smooth and well combined.
Whip Cream: In a separate bowl, whip the heavy whipping cream until stiff peaks form. Gently fold the whipped cream into the peanut butter mixture until fully incorporated, creating a fluffy texture.
Assemble Pie: Spread the peanut butter mixture evenly into the pre-baked pie crust, smoothing the top with a spatula.
Make Chocolate Ganache: In a microwave-safe bowl, combine the chocolate chips and 1/2 cup heavy cream. Microwave in 30-second intervals, stirring between each, until the chocolate is melted and smooth.
Top with Ganache: Pour the chocolate ganache over the peanut butter filling, spreading it evenly to cover the entire top of the pie.
Add Candy Toppings: Decorate the top of the pie with an assortment of Reese's candies, adding a fun, colorful touch.
Chill and Set: Refrigerate the pie for at least 4 hours or until fully set before serving.