Prepare your dish – Lightly grease or line a 9x13-inch baking dish with parchment paper.
Layer the base – Arrange 6 ice cream sandwiches side-by-side in the bottom of the dish.
Add fudge layer – Spread half of the warmed hot fudge sauce evenly over the sandwiches.
Add whipped topping – Spread half of the whipped topping over the fudge layer.
Repeat layers – Add another layer of 6 ice cream sandwiches, the remaining fudge sauce, and the rest of the whipped topping.
Top it off – Sprinkle crushed cookies, candy, or sprinkles over the top. Drizzle with caramel sauce if desired.
Freeze – Cover tightly with plastic wrap or foil and freeze for at least 2 hours (or overnight for best results).
Serve – Slice with a sharp knife and enjoy!