Update: Today I substituted pure oat flour for wheat flour in the above recipe, changing nothing else and it worked great. I don’t know if this helped, but I ground the flour myself and it was very fine like cake flour.
Note: A Hilditch cup of flour is 4.9 oz. The rest of the USA thinks it is 4.2 oz. They are wrong. I don’t know how much it was in cups (more than one) but it was 4.9 oz of oat flour. Second, the water could be bumped up to 1/2 cup as the batter was just a tad on the thick side, but not necessary. The batter got to rest 15 or 20 minutes before being used.
Good flavor, color, crumb and crunch. Next time I’ll buy my oat flour at a store. My mill did not not like making oat flour. We gave them a ‘9’. Give it a try.
Hilditch