Crush cookies by processing until very fine in a food processor or Ninja (Ninja is better). If you don't have these appliances, place cookies in a plastic zipper-seal bag and use a rolling pin to crush. It will take about 30 cookies to make 3 cups of crumbs.
Place crumbs in a 11 x 7-inch rectangular pan (you can use 9 x 9-inch--freezing time will be extended though. I used 11 x 7). Distribute crumbs evenly in the pan and press down to form a crust. Set aside.
Remove from freezer and allow dessert to sit for 10 minutes. Cut into squares. Top with additional whipped topping, chopped peanut & caramel candy bars and chocolate ganache if desired. For the ganache, microwave 1/2 cup chocolate chips and 2 tbs heavy cream for 30 seconds. Stir until no lumps remain. For thinner ganache, add a bit more cream.