I made an oat flour loaf recently that was horrible for many reasons. It was heavy, although not quite a brick. It failed to achieve a nice brown crust. Figuring that even the worst can be eaten with jam, I cut a slice and couldn't even get through the first bite. The loaf was bitter. I'd sweetened with molasses, my favorite, and proceeded with a pretty generic formula except for using about two thirds oat flour and a handful of thick cut rolled oats. Not recommended. Bitter, grayish bread. Horrible.