Traditional Homemade Yogurt
Countertop or oven option: Cover and place the saucepan of liquid yogurt in a warm spot in your kitchen or in a gas oven with just the pilot light on. The time it takes to incubate depends on your environment temperature, culture strength, and other factors.
Slow cooker or Instant Pot(R) option: To speed up the process, place jars of liquid yogurt in your slow cooker or Instant Pot(R) and fill it with warm water. Set the device to Warm and let the yogurt sit until set, around 4 to 6 hours. You can also incubate the jars in an insulated cooler surrounded by warm water.
To make Greek yogurt, place yogurt in a strainer lined with several layers of cheesecloth, over a bowl or in the sink. Let drip for 30 minutes to several hours, until it reaches the perfect consistency for your tastes.