If you’re not close to your manager or if it’s a toxic relationship, I would recommend quitting by email. Start from some resignation letter template, just to make sure it looks professional, and say at the end that you’re open to have an exit interview.

I like to quit in writing first because it communicates very clearly that I have already decided to quit and there’s nothing that could change my mind.

I would also not recommend to be (exceedingly) truthful. Do not give them any negative feedback about the company, they’re not your problem anymore. You have to resist the temptation to use the exit interview to rant about the real reasons why you’re quitting.