01 - Combine crushed chocolate sandwich cookies with melted butter in a mixing bowl, stirring until the crumbs are evenly coated. Press the mixture firmly and evenly into the bottom of a 9-inch springform pan. Freeze for 15 minutes to allow the base to firm up.
02 - Using an electric mixer, beat the softened cream cheese, creamy peanut butter, and powdered sugar together until completely smooth and free of lumps. Gently fold in the thawed whipped topping with a rubber spatula until no streaks remain. Spread this mixture evenly over the chilled cookie crust.
03 - Place 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 for 3 to 5 minutes, then pour it evenly over the peanut butter layer, tilting the pan gently to distribute.
04 - Cover the pan tightly with plastic wrap and refrigerate for at least 4 hours, or ideally overnight, until all layers are firmly set.
05 - Spread the remaining whipped topping evenly over the chilled chocolate layer. Scatter chopped roasted peanuts and chocolate shavings across the surface if desired.
06 - Remove the dessert from the refrigerator and slice into squares or wedges using a sharp knife. Wipe the blade clean between cuts for neat portions. Serve well chilled.