½cupplain Greek yogurt or yogurt starter saved from last batch
Instructions
Remove yogurt starter from fridge. Turn slow cooker to LOW to heat up.
Pour milk into pot and attach candy thermometer to side. Stirring occasionally, warm the milk over medium heat until 185°F (about 20 minutes).
Fill sink with ice cold water. Cover pot with lid and place in cold water. Allow milk to cool until 90-110°F (about 7-10 minutes).
Mix yogurt starter with 1 cup warm milk. Pour milk and starter mixture into slow cooker. Stir. Cover slow cooker and TURN OFF. Wrap sides and top with beach towel. Let sit 6-10 hours.
Remove beach towel and carefully transfer slow cooker liner to fridge. Do NOT stir or shake. Allow to cool completely (or overnight).
Strain yogurt through a cheesecloth or coffee filter (about 5 hours).
Set aside ½ cup plain yogurt to use as the starter for your next batch of yogurt!
Store yogurt tightly covered in fridge up to 2 weeks. Save whey tightly covered in fridge up to 2 weeks.
Notes
Milk: any cow milk will work fine but will affect the flavor of the final product. Most store-bought yogurts are made with 2% milk. Baby yogurt is made with whole milk.
8 cups milk is 1/2 gallon.
Yogurt starter: plain Greek Yogurt is recommended as a starter, but plain regular yogurt can be substituted.
When milk reaches a temperature of 150°F, stir more frequently to prevent scorching.
Culturing Time: Shorter time will result in a milder and thinner yogurt. Longer time will result in a thicker, tangier yogurt. I like to culture for 7-8 hours.
If doubling this recipe, use 2/3 cup yogurt starter to culture 1 gallon of milk. Heating time will increase to about 35 minutes and cooling time will increase to about 15 minutes. Monitor closely.