01 - Combine the crushed chocolate sandwich cookies with melted butter in a mixing bowl, stirring until the crumbs are evenly moistened. 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 firm up.
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 peanut butter mixture in a smooth, 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 perfectly smooth. Let the ganache cool for 2 to 3 minutes, then pour it evenly over the peanut butter layer, tilting the pan gently to achieve uniform coverage.
04 - Cover the pan tightly with plastic wrap and refrigerate for a minimum of 4 hours, or ideally overnight, to allow all layers to set completely.
05 - Spread the remaining whipped topping in an even layer over the set chocolate surface. Scatter chopped roasted peanuts and chocolate shavings across the top, if desired.
06 - Cut into squares or wedges using a sharp knife dipped in warm water for clean edges. Serve thoroughly chilled.