01 - Pour whole milk into a saucepan and heat over medium heat until it reaches 180°F, stirring occasionally to prevent scorching the bottom.
02 - Remove saucepan from heat and let milk cool down to 110°F. This temperature is ideal for activating the live cultures.
03 - In a small bowl, whisk together 2 tablespoons of the cooled milk with the plain yogurt starter until completely smooth.
04 - Pour the starter mixture back into the saucepan with the remaining cooled milk. Stir gently but thoroughly to distribute the culture evenly.
05 - Transfer mixture to a clean container, cover, and wrap in a towel to maintain warmth. Place in a warm spot or use a yogurt maker. Let culture undisturbed for 6 to 8 hours until set.
06 - Line a strainer with cheesecloth and set over a bowl. Pour the set yogurt into the lined strainer. Refrigerate for 1 to 2 hours, depending on desired thickness.
07 - Transfer thickened yogurt to an airtight container. Refrigerate until ready to serve.