actually I do have a clue, the pioneers coming west really only had dried foods and flour. The key was the bean as you see above. When cooked if you have a hunk of bread to sop it up with it goes a lot further. So a simple bread was made of flour, baking powder, and a little salt. Cooked in a frying pan over the fire. Now my guess one day some clever pioneer said it reminded him of a plain biscuit. And their it began. I would imagine the cooks figured out if they made it better and with a little more water it could sop up more beans.
Thats the best I can do, and it took a beer and a trip to my balcony to come up with it.
