For our small crock pot, we use a Wallyworld Grease pot to bake in. Being lazy, we often use some Jiffy cornbread mix or something similar. We have also done biscuits and brownies. You just put something like ss nuts in the bottom of the crock pot to raise the bottom of the baking pan enough for air to flow under it and bake away. We haven't done it for a while (we discovered it when we had our first motorhome, it had no oven. Now we have an oven, so we just use it instead of the crock pot), so I don't recall the baking times, but the old toothpic test works fine. We also have a larger oval crock pot, in it we used two loaf pans, the first sitting on the nuts, the second on a couple of pieces of coat hanger wire placed across the top of the bottom pan. That way we could bake two different things at the same time. We were surprised to learn that biscuits browned a little bit on top when done...
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OBG