01 - Heat the milk in a saucepan over medium heat until it reaches 180°F, stirring occasionally to prevent scorching.
02 - Remove from heat and allow the milk to cool to 110°F.
03 - In a small bowl, mix 2 tablespoons of the cooled milk with the plain yogurt starter until smooth.
04 - Stir the yogurt starter mixture back into the cooled milk and mix gently.
05 - Pour the mixture into a clean container and cover. Wrap the container in a towel to keep warm or use a yogurt maker.
06 - Let the milk culture for 6 to 8 hours, undisturbed, in a warm place until set.
07 - For Greek yogurt's thick texture, line a strainer with cheesecloth and set over a bowl. Pour the yogurt into the strainer and refrigerate for 1 to 2 hours until desired thickness is reached.
08 - Transfer the thickened yogurt to a clean container. Refrigerate until ready to serve.