Start by laying 6 ice cream sandwiches in a single layer in a rectangular dish.
Spread half of the whipped cream over the ice cream sandwiches.
Drizzle half of the chocolate syrup over the whipped cream.
If using, sprinkle half of the crushed cookies and sprinkles on top.
Repeat the layers with the remaining ice cream sandwiches, whipped cream, chocolate syrup, and toppings.
Cover the dish with plastic wrap and freeze for at least 4 hours or until firm.
Slice and serve chilled, garnished with additional toppings if desired.