Pour a half gallon of milk into the Instant Pot, and press the 'sauté' button.
Whisking constantly, allow the milk to rise to 180 degrees. I use a small pocket thermometer to test the temp.
Press 'cancel' to turn it off.
Allow the milk to cool back down to 115 degrees.
Whisk in ¼ cup of plain yogurt. You can either use store bought, or start with a starter culture.
Set Instant Pot for 8-24 hours on the yogurt setting.
When the timer goes off the yogurt is ready.
Transfer to a storage container and refrigerate.
