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Keep the mint in a single layer with as little overlap as possible. Mint leaves will dry more evenly if kept in a single layer since each leaf will receive the same amount of heat as the others. Leaves that are in stacks or piles will need to be stirred during the process, and some may finish drying out well before others. Place the dehydrator tray back into the dehydrator and turn the device onto the lowest temperature setting available. A low amount of heat is all that you need to dry mint and similar herbs. If your dehydrator does not have a thermostat, you should check the device more often during the dehydrating process to prevent the leaves from burning. Remove any unnecessary trays before you begin. Doing so will clear more room for larger leaves and increase the overall amount of air circulation the mint leaves receive. Check the mint every five minutes or so. Remove the mint from the device as soon as it appears dry. The edges should begin curling up and the leaves should look crispy yet green.
Spread the mint leaves out on a dehydrator tray. Switch the dehydrator onto the lowest setting. Dehydrate until dry.