Yes, two layers can be processed at once! In both the boiling water bath or pressure canner but there are a couple things to keep in mind. For example, you want to place a small wire rack between the layers. You just need some kind of ventilated metal platform between the two layers. DO NOT stack jars directly on top of each other. The purpose of the platform being ventilated is to allow boiling hot water, or steam, to move freely throughout the pot. Make certain that the water covers the tops of all jars by 1 inch in a boiling water bath canner. Pay attention to the depth of your canner, the pressure canner should have 2 to 3 inches of water in the bottom. Click here for a quality pressure canner I recommend.
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