First, you may have stopped roasting the nuts before they reach peak oiliness, so next time, consider roasting just a few minutes longer. However, at this stage, you can’t pop them back in the oven. Try drizzling a bit more oil into the processor as it is running; this should help to make your batch nice and creamy. You can also try using some maple syrup or honey to help emulsify it and add some extra flavor!