I heard about this on the news.
https://duckduckgo.com/?q=mung+bean+eggs&ia=recipes
They hadn't heard of Mung beans, but I believe I've eaten them.
edit:
Then there is this:
https://youtu.be/x_ljrSieeP4?t=2558
Solein is a protein powder that looks and tastes like wheat flour made from water, air and electricity. Maybe those breatharians were onto something. Just don't eat air raw?