Re: baking in canning jars?
I researched this a while back, and from what I gathered it is a toss up. The problem is that the temperature the cake/bread needs to reach in order to fully cook it, may not be a high enough temp. to kill any bacteria that could have found their way into the batter. So, you *could* be incubating some icky stuff in there. IIRC the companies who make these to sell keep a check on the internal temp. to be sure it has reached a high enough temp to steralize everything inside the jar.
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