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 springform pan. Transfer to the freezer for 15 minutes to firm up the base.
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 evenly incorporated. Spread the filling in an even layer 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 evenly over the peanut butter layer, tilting the pan gently to achieve a uniform coating.
04 - Cover the pan with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, until all layers are fully set.
05 - Spread the remaining whipped topping evenly over the set chocolate layer. Garnish with chopped roasted peanuts and chocolate shavings if desired.
06 - Remove the springform ring and cut into squares or wedges with a sharp knife. Serve thoroughly chilled.