My all-time favorite is extra sharp cheddar, but any cheese is worth my time! After making yogurt last week, I had about a quart of milk left over. So I made some cheese!
Farmer cheese, and its cousin paneer, is by far the simplest cheese to make - you don't need rennet, it doesn't need to age, and there are only two ingredients.
Got milk? Got vinegar? Great - let's make cheese!