I would say:
Посмотрим, что у нас есть покушать!
Посмотрим is a good equivalent of "Let's see" in the physical sense.
It can also be used with the meaning of "We will see" when you are not sure about some future events.
Very often! And in any context. It is just a sort of "relaxed pronunciation" (compare: "meet you" being pronounced as "mee-chue").