Extending Your Plain or Greek Yogurt

When I get near the bottom of my container of plain regular or Greek yogurt, I add milk, stir, place covered in hot water, and let the milk develop for a few hours into a new container of yogurt. Chill. This is not a science with me, but there are optimal temperatures, if you look online. I'm not picky about the consistency and quality of the yogurt, so you can experiment to suit yourself.