Pack the ice cream hard and use whatever flavor you have on hand. I used chocolate chip cookie dough.
We also poured hot fudge over everything once it was all in the dish.
My son didn't want to leave the oreos whole, but I would definitely do that next time. I would have liked the extra crunch!
You could use caramel sauce instead of the hot fudge.
You could always double the recipe and use a 9x13 baking dish.