It's really easy to make excellent yogurt at home! This recipe can be scaled up or down, and makes delicious vanilla (or plain) yogurt.
1/2 gallon milk (I really prefer 2% or whole milk, for a thicker yogurt.)
1 cup sugar (optional)
1 Tbsp vanilla extract (optional)
1 6-8 oz package plain store-bought yogurt (must read "contains active cultures")
You'll also need:
Canning jars or other containers
A heat source (for incubating the yogurt)
*Note: If you just want to make plain yogurt, skip the sugar and vanilla extract, and just use the milk. This is the only way I make yogurt now! I prefer adding my flavorings in the form of whole fruit, granola, etc.
Heat milk to 180 degrees, and add the sugar. Stir until it's completely dissolved.
If you want plain yogurt, skip the sugar but still heat the milk.