01 - Combine the crushed chocolate sandwich cookies with melted butter in a mixing bowl, stirring until the crumbs are evenly coated. Transfer the mixture to a 9-inch springform pan and press firmly into an even layer across the bottom. Place the pan in the freezer for 15 minutes to allow the crust to set.
02 - Using an electric mixer, 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 uniformly 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 for 2 to 3 minutes, then pour it in an even layer over the peanut butter filling.
04 - Cover the pan with plastic wrap and refrigerate for a minimum of 4 hours, or ideally overnight, until all layers are firmly set.
05 - Spread the remaining whipped topping evenly across the chilled chocolate layer. Garnish with chopped roasted peanuts and chocolate shavings if desired.
06 - Remove the dessert from the refrigerator, release the springform ring, and cut into squares or wedges. Serve immediately while well chilled.