This is an awesome find tucked away at the Cosmopolitan hotel. Just so you know, it is not easy to find, and is not on any of the signs in the hotel. Best pay attention to these reviews!
I got a slice of pepperoni pizza that was large enough for me to eat off of 3 times. It was very yummy. They stay open pretty late but I can't remember the exact hours, so it's good for a late night snack.