01 - Combine the crushed chocolate sandwich cookies with melted butter in a mixing bowl, stirring until the crumbs are evenly moistened. Press the mixture firmly and uniformly into the bottom of a 9-inch square or round springform pan. Transfer to the freezer for 15 minutes to firm up.
02 - Using an electric mixer, beat the softened cream cheese, creamy peanut butter, and 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 just incorporated. Spread the filling evenly over the chilled cookie crust.
03 - Place the semisweet chocolate chips and heavy cream in a microwave-safe bowl. Heat in 20-second intervals, stirring between each burst, until the mixture is glossy and smooth. Let the ganache cool briefly, then pour it in an even layer over the peanut butter filling.
04 - Cover the pan tightly and refrigerate for at least 4 hours, or ideally overnight, to allow all layers to set properly.
05 - Spread the remaining whipped topping evenly over the set chocolate layer. Scatter chopped roasted peanuts and chocolate shavings across the surface if desired.
06 - Cut into squares or wedges using a sharp knife. Serve thoroughly chilled for the best texture and flavor.