Preheat your oven to 350°F (175°C). Crush the chocolate cookies into fine crumbs and mix in melted butter. Press mixture into a 9-inch pie dish and bake for 10 minutes, then let cool.

In a large mixing bowl, combine creamy peanut butter, powdered sugar, and vanilla extract. Blend on medium speed until smooth, then spread evenly over cooled crust.

In a microwave-safe bowl, combine chocolate chips and heavy cream. Microwave in 30-second intervals, stirring until melted. Cool slightly and pour over peanut butter layer, swirling gently with a knife.

Cover the pie and refrigerate for at least 2 hours to set. This step is crucial for holding shape when sliced.

Garnish with chocolate shavings, slice, and serve to enjoy the delightful combination of crunchy crust, creamy filling, and rich ganache.