Crisps. Unless you are referring to a packet of chips, which you may also refer to as a bag of crisps, which you may also call chips. This is on the citizenship test, by the way. Every other answer is “Sir Donald Bradman”.
I've consigned myself to never reaching proficiency in either.
For the non-Australians, we don't really say parmigiana either, it's parmi or parma and there's a lot of playful debate over the naming.
It's a packet of chips if you mean crisps, or just chips if you mean hot chips. In a situation where disambiguation is needed I'd probably clarify with "hot chips".