01 - Combine crushed chocolate cookies with melted butter in a mixing bowl, stirring until the crumbs are evenly moistened. Press the mixture firmly and evenly into the bottom of a 9-inch springform pan. Freeze for 15 minutes to set the crust.
02 - Beat cream cheese, peanut butter, and powdered sugar in a large bowl using an electric mixer until completely smooth and creamy. Gently fold in the whipped topping until uniformly combined. Spread the mixture evenly over the chilled cookie base.
03 - Combine chocolate chips and heavy cream in a microwave-safe bowl. Microwave in 20-second intervals, stirring between each burst, until the ganache is smooth and glossy. Let cool slightly for 2 to 3 minutes, then pour evenly over the peanut butter layer.
04 - Cover the pan with plastic wrap and refrigerate for at least 4 hours, or ideally overnight, until all layers are firmly set.
05 - Spread the whipped topping evenly over the chilled chocolate layer. Garnish with chopped roasted peanuts and chocolate shavings if desired.
06 - Cut into squares or wedges using a sharp knife. Serve well chilled.