
Pour milk into the slow cooker and cook on high for 2 - 2 1/2 hours.
Heat to 180 degrees.
Turn off the slow cooker and allow milk to cool to 110 degrees.
Allow the yogurt to come to room temperature while the milk is cooling.
Once the milk has cooled to 110-120 degrees, mix in the yogurt and whisk gently.
Wrap the slow cooker with towels and let it sit for about 6-12 hours.
Remove the towels and place in the refrigerator for 2 hours to cool completely.
Whisk until smooth and enjoy, or strain for Greek yogurt.