https://greekreporter.com/2025/02/20/ancient-greek-baker-invented-oven/
Not sure how good the article is but again, what the heck... :)
One might meed to account for the plentiful scenes of Ancient Egyptian large scale baking activities e.g.
https://www.metmuseum.org/art/collection/search/544258
But the larger scale ovens might be novel - ancient baking technology isn't something I've studied.