You need an Instant Pot. There is a "Yogurt" button.

Ingredients: Milk (any milk works); Plain yogurt for grocery stores.

Steps:

1, Clean the pot. Add a cup of plain water and pressure cook for 1 minute. Release the pressure and dump the water. This is to thoroughly remove whatever bacteria.

2, Add milk. Press the Yogurt button a couple times until you see it shows "boil".

3, Cool down the milk until it's at a temperature good for drink directly.

4, Mix a couple spoonfuls of plain yogurt with the milk in a bowl. Add it to the pot.

5, Press the Yogurt button and set the time to 12 hours.

6, Refrigerate the yogurt for a few hours.

That's it!