No caption accompanies this photo, but based on the before and after images, it appears that biscuits are being made here.
Date, location and photographer are uncertain. [American Memory link]
Showcasing some of the 160,000 images taken between 1935 and 1944 by government-hired photographers. (If you were to look at 100 of them per day, every day, you'd need more than four years to view them all).