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 and chill for 15 minutes until set.
02 - In a large bowl, beat together the softened cream cheese, creamy peanut butter, and sifted powdered sugar using an electric mixer on medium speed 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 smooth, glossy, and fully emulsified. Let the ganache cool for 2 to 3 minutes, then pour it evenly over the peanut butter layer, tilting the pan gently to achieve a uniform surface.
04 - Cover the pan tightly with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, until all layers are firm and fully set.
05 - Spread the remaining whipped topping in an even layer over the chilled chocolate ganache. Sprinkle with chopped roasted peanuts and finish with chocolate shavings if desired.
06 - Using a sharp knife warmed under hot water and dried, slice into squares or wedges. Serve immediately while well chilled.