The new neighbors brought over some "country bread" that just looked like it ought to be made into French Toast. So here is my try:
1T baking powder
Then I added several cups of cashew milk and water.
There was slightly more milk than water. By the time I added
the liquid, the blender was 3/4 full or fuller.
I added cinnamon and some oil and a little salt to the mix.
This seems to be working. It covers more bread than I expected. Probably 1 1/2 to 2 loaves easily. The bread soaks up the liquid faster, so you may need to add a little liquid to the batter as you go, maybe halfway through.