Pour milk (one gallon) into Instant Pot and click the "yogurt" function until you see it say "boil". Leave it on this function and you will hear a beep. At this point, the Instant Pot will handle bringing your milk up to a boiling temperature (about 180°F). Once it reaches the proper temperature, the boil function will cut off and the yogurt will begin to cool down.
Monitor the temperature of the milk with a thermometer until it reaches about 110°F (this could take an hour or two and you can speed the process along by removing the insert from the Instant Pot).
Once the milk has cooled to the proper temperature, mix in yogurt (1/4 cup). Whisk into milk well. Cover Instant Pot with lid and select the "Yogurt" function again. You are able to set the time, anywhere from 8-24 hours. The longer you ferment your yogurt, the healthier it will be. My preference is around 16-18 hours. I would recommend 8-10 hours your first time. This time is referred to as the "incubation period".
Once the yogurt fermentation time has completed, remove the insert from the Instant Pot, cover and refrigerate for at least 6 hours, though overnight is ideal.
Once your yogurt has chilled, transfer to your storage jars and enjoy in smoothies, as a snack, in baking and more!
