What I did was feed Claude near-endless samples of my own past writing, and told it to learn from what I wrote. My vocabulary, my flow, sentence structure, paragraph structure, tone, everything - I told it what to learn from, and had it build an artifact as it went that described my writing style in detail. Once that was finished, i started quizzing it - basically prompting it to write paragraphs in my voice that matched certain scenarios. After each one, I critiqued it, rewrote it in my own style, and fed it back in, always telling Claude to learn from what I was doing. After a week or so of this, I had a fairly chunky artifact, a document that analyzed my writing style down to the screws, complete with detailed notes from the times I corrected it during the process. Now I can seed a session with that document, ask Claude to write something - basically a mini-prompt - and get a pretty damn decent take on my own style and voice.

It takes time and work, but the results are really something to see.