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 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 softened cream cheese, creamy peanut butter, and powdered sugar in a large bowl until completely smooth and no lumps remain. Gently fold in the thawed whipped topping using a rubber spatula, preserving as much air as possible. Spread the filling 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 2 to 3 minutes, then pour it in an even layer over the peanut butter filling.
04 - Cover the pan tightly 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 across the chilled chocolate layer. Garnish with chopped roasted peanuts and chocolate shavings if desired.
06 - Cut into squares or wedges using a sharp knife dipped in hot water for clean edges. Serve thoroughly chilled.