This is an ingredient that has featured in many of my family's desserts for over 15 years now. After draining the yogurt you can save the whey that has collected underneath, which is quite good for you, and use it in a drink or other cooking. Here is a recipe for making a drink with leftover whey, Recipe ID: 2389938 and here is a recipe for pancakes with whey, Recipe ID: 2389847.
500 ml yogurt will yield about 200 g of yogurt cream. Please try using this yogurt cream as a substitute for cream cheese in many kinds of desserts. It also tastes good eaten with fruit or spread on bagels.