01 - Combine the crushed chocolate sandwich cookies with the melted butter in a medium bowl, stirring until the crumbs are evenly moistened. Press the mixture firmly and evenly into the bottom of a greased 9-inch springform pan to form a compact crust. Transfer to the freezer for 15 minutes to firm up.
02 - Using an electric mixer on medium speed, beat the softened cream cheese, creamy peanut butter, and sifted powdered sugar together in a large bowl until completely smooth and free of lumps. Gently fold in the thawed whipped topping with a rubber spatula until no white streaks remain. Spread this filling evenly over the chilled cookie crust, smoothing the surface.
03 - Place the semisweet chocolate chips and heavy cream in a microwave-safe bowl. Heat in 20-second intervals, stirring after each burst, until the mixture is glossy and smooth. Let the ganache cool for 2 to 3 minutes, then pour it over the peanut butter layer, tilting the pan gently to coat the surface evenly.
04 - Cover the pan tightly with plastic wrap and refrigerate for at least 4 hours, or ideally overnight, until all layers are firm and fully set.
05 - Spread the remaining whipped topping over the chilled chocolate layer in an even layer. Scatter chopped roasted peanuts and chocolate shavings over the top, if desired.
06 - Run a thin knife around the inside edge of the springform pan, then release the sides. Cut into 8 even squares or wedges. Serve well chilled.