INSTRUCTIONS
Warm the milk in a medium-sized saucepan, stirring often, until the temperature reaches between 175-180ºF. Allow milk to cool, stirring occasionally, until the temperature reaches between 100-115ºF. Whisk in the yogurt and pour mixture into a large ceramic or glass bowl, or round casserole dish.
Starting with a cold oven, turn on the heat for one minute just to take the chill off. Cover the bowl of milk/yogurt with plastic wrap or a lid; wrap with a couple kitchen towels and place in the oven, with the oven light on (to keep it warm). Let inoculate for 8-12 hours or until thickened into yogurt. Stir and store in the fridge for regular unsweetened yogurt or strain out the whey for Greek yogurt.