1. Microwave chocolate sauce and peanut butter in microwave-safe bowl for 1-2 minutes to make it spreadable. Stir and set aside to cool. Save a little for garnishing top of cake.
2. Place half of the ice cream sandwiches into 9x13-inch pan.
3. Spread half of peanut butter chocolate mixture, whipped topping and peanuts over sandwiches.
4. Repeat layers. Cover and freeze for 1 hour or until firm.