Add the peanuts to the bowl of your food processor. process until very smooth, about five minutes. you may need to take a couple breaks - your processor might get too hot, the nuts may form a large ball that needs to be broken up, and towards the end, the mixture may splash up the sides. the peanut butter will go through a couple stages - crushed nuts, start to form small balls, form one large ball, and finally smooth out to peanut butter. these are all normal. if you think yours isn't coming out right, just process it some more.
Add the melted white chocolate and blend. taste and add more if you'd like.
If the consistency is too thick, add vegetable oil, a bit at a time, until it's the consistency you like. Store in the refrigerator.