Heat the milk for 2 minutes in the microwave and test with your pinky finger. It should feel just ever so slightly warmer than your skin temperature but not burn you. You're aiming for about 110F on the temperature.
Pour a little of this warm milk into your starter and mix until it's well-dissolved.
Pour this mixture into your warm milk and mix once again.
Pour this into a mason jar, a ceramic crock, or some other container that is heat proof and will fit into your electric Instant Pot. I use pint size mason jars, but you can also make the yogurt directly in the inner liner.
Once the yogurt is set, you want to strain out the whey. You can use cheesecloth or a large coffee filter in a large stainless strainer, place the strainer over a bowl and let it drip in the fridge overnight.
Turn on the yogurt button, put your jars into it, set it for 8 hours, place a glass lid on the pot, and let it rest for 8 hours. If you're using your Instant Pot lid, leave it at venting, not sealing to make the yogurt.
Oven with pilot light
Just set your pots in there for 8 hours or until the yogurt is set. Once the yogurt is set (usually 8 hours), you want to strain out the whey. You can use cheesecloth or a large coffee filter in a large stainless strainer, place the strainer over a bowl and let it drip in the fridge overnight.
Alternatively, you can buy a Cuispro Donvier yogurt maker which is easier to clean up. For larger quantities of yogurt, a Eurocuisine Greek Yogurt Maker works better.
Slow Cooker
Turn your slow cooker on high as you start the yogurt making, and place jars in it, turn it off, and cover with towels or some other insulation so the pot stays warm.
Once the yogurt is set (usually 8 hours), you want to strain out the whey. You can use cheesecloth or a large coffee filter in a large stainless strainer, place the strainer over a bowl and let it drip in the fridge overnight.
Alternatively, you can buy a Cuispro Donvier yogurt maker which is easier to clean up. For larger quantities of yogurt, a Eurocuisine Greek Yogurt Maker works better.
Please read the post for tips on how to make homemade yogurt in the oven, or on the countertop, as well as ways to make non-dairy yogurt.