We purchased a Vitamix earlier this fall and I decided to give making peanut butter a try. I bought some raw Valencia peanuts online from Amazon. We dry roasted them for 15-20 minutes on 350. Then comes the most dreaded task. Removing the skins. When the peanuts are roasted they release a bit of oil. After they cool, pick up a handful and rub them between your hands. The skins fall to pieces and the peanuts slip out. Definitely get the kids involved if you want peanut skins all over your kitchen. :)
Here is our bowl of skinned peanuts. Not perfect, you can see. But a pretty good job. This is 4 cups of peanuts. I found that 4 cups of peanuts made approximately 3 cups of peanut butter.
Into the Vitamix they go.
Depending on the consistency you like, you can add coconut oil -- I added about a Tablespoon and a bit of salt as well.
Couple things I discovered along the way -- the longer you roast the peanuts, the darker the peanut butter will be -- and it will have a little bit more of a nutty flavor. And... I also found that making everyone help with the skinning of the peanuts helps you not harbor bitter feelings when all the peanut butter is eaten within 12 hours of you making it. :)