Line the Sieve with 3-4 layers of cheese cloth.
Place over a container so that the kiquid can drip out without touching the sieve.
Fill with plain yogurt.
Leave refrigerated overnight.
In the morning, it should resemble the consistency of cream cheese.
Put back in original container and use as a replacement for cream cheese, for creamy sauces (tuna noodle cheese, beef stroganoff, etc.)