Prepare the crust by mixing chocolate graham cracker crumbs and melted butter, then press into a 9-inch pie pan and chill for 15 minutes.
Make the peanut butter filling by beating together creamy peanut butter and powdered sugar until smooth, then fold in whipped heavy cream and vanilla extract.
Prepare the chocolate topping by melting semi-sweet chocolate chips and coconut oil in the microwave until smooth.
Assemble the pie by spreading the peanut butter filling into the chilled crust, drizzling the melted chocolate on top, and swirling it for a decorative effect. Refrigerate for at least 4 hours.