The last cookie was a success. However, it was kind of a pain to get the warm cookie out of the bottom of the oven. While catching up on the dutch oven mailing list I happened to see a thread that mentioned that you can cook in the lid with the entire oven upside down for pies and other baked goods. I call it dutch oven hard mode.
I did this a few weeks ago and didn't think to take any pictures. The coals were something like 10 bottom / 24 top and it sat for around 45 minutes. I made one unfortunate mistake: while glancing over the ingredient list I saw the word "Baking" and reached for baking powder. The resulting cookie was ok but fluffy and cake like. It was also a bit dry/burnt because the puffy cookie had a different surface appearance that caused me to leave it on too long. With the coal count I gave a properly done recipe should be done in 30.
Next up: baked beans! Finally!