https://www.jst.go.jp/pr/announce/20221017/pdf/20221017.pdf

Kosuke Sato and colleagues have embedded “edible information” into cookies using a 3D printer. 2D codes, or AR markers, are created through cavities when the food is printed and remain intact during baking. They can be read again when the back of the cookies are exposed to high-frequency light, and not only store data about the recipe and production, but can also be linked to other Internet-enabled devices, such as coffee machines that select coffees that match the cookie flavor.