Creating this Chocolate Peanut Butter Pie is simple when you follow these clear steps:

1. Prepare the Filling: In a mixing bowl, beat together the creamy peanut butter and powdered sugar until well combined.
2. Make the Whipped Cream: In a separate bowl, whip the heavy cream with a hand mixer until stiff peaks form. Add in the vanilla extract and cocoa powder (if using) and mix until just combined.
3. Combine: Gently fold the whipped cream into the peanut butter mixture until fully incorporated.
4. Pour into Crust: Spoon the combined filling into the pre-made graham cracker crust, smoothing the top with a spatula.
5. Melt Chocolate: In a microwave-safe bowl, heat the chocolate chips in the microwave in 30-second intervals until melted. Stir between intervals to avoid burning.
6. Drizzle Chocolate: Once melted, drizzle the chocolate over the peanut butter filling using a spoon or a piping bag for a decorative touch.
7. Chill: Cover the pie and place it in the refrigerator for at least 3-4 hours or until firm. For the best results, let it chill overnight.
8. Serve: When ready to serve, top with additional whipped cream and chopped peanuts for garnish.

These steps will lead you to a delightful Chocolate Peanut Butter Pie that your friends and family will adore!