PREP PAN: Line an 8 x 8 inch baking dish with parchment paper, leaving some overhang for easy removal.
ADD OREO BASE: Arrange 20 Oreo cookies in a single layer on the bottom of the pan. Break some cookies in half to fill any gaps.
ADD FIRST LAYER: Spread 1 cup of the 1 cup whipped topping, thawed evenly over the Oreo layer.
ADD ICE CREAM SANDWICHES: Place 16 mini ice cream sandwiches in an even layer over the whipped topping.
ADD SECOND LAYER: Spread the remaining 1 cup whipped topping, thawed over the ice cream sandwiches.
ADD TOPPINGS: Sprinkle crushed Oreo cookies over the top and add any additional toppings if desired.
FREEZE: Cover and freeze for at least 4 hours, or until firm.
SERVE: Lift the cake out using the parchment paper. Slice and serve. Drizzle with Chocolate syrup and add toppings if desired.
Notes
Make-Ahead: This cake can be made up to 3 days in advance and stored in the freezer.Storage: Store covered in the freezer for up to 1 week.Freezing Tip: For clean slices, let the cake sit at room temperature for 5 minutes before cutting.Ingredient Tip: Mini ice cream sandwiches fit perfectly in an 8 x 8 pan, but you can use full-size sandwiches and cut them to fit if needed.