Add the cookies, peanuts, and salt to the bowl of a food processor.Pulse until the cookies are crushed and peanuts have been chopped into small pieces. Add the crushed mixture to a large bowl and drizzle the melted butter over the top. Stir to coat all the crumbs in butter.
Pour the crust mixture into a deep-dish pie dish. Press firmly with fingers the crust in the bottom and up the sides of the dish. The crust will be thick. Refrigerate to allow the crust to firm up.
In a large bowl, use a mixer to beat heavy cream until frothy. Gradually add the powdered sugar, and mix until it begins to form. Add the peanut butter mixture to the beaten cream, mixing well after each addition. Spread the mixture into the prepared crust.
In a small bowl, melt peanut butter in the microwave until pourable. Drizzle the melted peanut butter over the top of the prepared pie. Refrigerate and allow the pie to firm up. Store covered in the refrigerator. Serve chilled!