Presumably we could do the same thing with fungus if we saw the economic/moral/sustainability incentives.

Edit: an article about ancient corn (https://blogs.ifas.ufl.edu/news/2023/01/24/uf-researchers-di...)

  Teosinte is a small, grass-like plant that forms ears of six to eight kernels. Each kernel is encased in an acorn-like shell. These encased kernels grow on a thin stem, not the thick cob that characterizes modern corn. The whole ear is about two inches long, the kernels no larger than peppercorns.

  About 10,000 years ago, the Indigenous peoples of what is now southern Mexico began selectively breeding teosinte. Over time, those acorn-like coverings retracted and formed a cob. Now exposed, the kernels were easier to harvest and could be bred for increased number and size, Koch said.

I think dry mushrooms are about 30% protein by weight, which is in the ballpark of dry meat.