This recipe makes a smooth peanut butter but if you want to make it crunchy, you can pulse a third of the roasted peanuts (before blending the rest) very briefly so that they are broken into small pieces.  Then set aside until after you’ve made your smooth peanut butter with the rest of the roasted peanuts. Then, you can stir these crunchy peanut pieces in or briefly pulse them into the peanut butter in the food processor/blender at the end.