1) Feedback (going both ways).
2) Anything that is blocking/bothering you.
3) How you feel about any recent developments in the team/company.
4) Long-term career stuff. What interests you, in what direction you want to be going.
5) Stupid organizational stuff you need assistance with (e.g. reimbursements).
6) Random smalltalk, personal stuff.
But i think the point of one-on-ones is to have some reserved time and space to discuss important things should you ever need to. If that need hasn't arisen yet, and you end up chitchatting and talking about the current project, that's great - that means you haven't had a crisis!
I have never had a job where my one on ones didn't devolve into status meetings and chitchat. What the hell am I supposed to talk about?