Right from the jar. That's how I tell people to eat peanut butter. However, for those of you that don't want knuckles covered in peanut butter (Not that there is anything wrong with that) you may like to have your nutty stuff on bread.
If you are going to wuss out in this way, we have for you our 5 ways to upgrade your peanut butter sandwich. It will be worth it :-)
And if you don't actually have any peanut butter (What exactly are you thinking?) you can pick some up here