Holy shit, i did it, lol. It looks terrible, but it works.
For people who haven't been keeping up with this project, I've been doing ceramics for a couple years now, and recently people kept tagging me in posts about a European feminist hacker collective that was making circuit boards out of court they dug out of the ground and fired in a campfire.
After having an epiphany about some experimental copper ceramics glazes i made last year, i thought i would see if i could solder to them, and i found that i could.
Sooo ... I made a stamp and stamped out some really basic boards for an astable multivibrator (two blinky lights) circuit. I filled the recessed traces with copper powder and had them fired in our pottery kiln.
Now i have ceramic circuit boards.