Launderess pretty much hit it on the head...
The "Idle Hour" cookbook is written specifically for the Chambers. As for cookies, it's pretty much as she stated: Bake like you normally would, and use retained heat for the last batch. The cookbook says to preheat, and then turn the gas off when the cookies begin to brown, if you want to use the retained heat.
Bear in mind, as well, that the "Thermowell" in the back right of the rangetop can also be used as a second oven. Perfect for a couple of baked potatoes, or a batch of biscuits, using the "Thermobaker" caddy. The beautiful thing about the Thermowell is that it can cook up to three side dishes at a time, using the "triple" pots, or two large sides, using the "doubles" or a huge stew with the large single kettle. And for these things, retained heat works wonderfully...it's the original "crock pot" only better.
While I have kvetched about the apparent small size of the oven myself, mainly due to the fact that some of my favorite cooking pans have a larger footprint, a little adjustment of batch sizes and cooking times will work it all out. Part of the fun of it is realizing that you are indeed, saving energy by using an "old appliance" rather than buying something "new" that's got many electronic chips and gee-gaws that will leave you without a stove, totally unable to cook if the power goes out...with a Chambers, you can be cooking even if the electricity goes out. And yeah...Cast Iron Rules! ;-)