In order to make a super smooth whipped feta, you need to give the dip time to fully blend in the food processor. Take your time (it takes a couple of minutes) and scrape down the sides of the food processor as needed to ensure all the pieces of feta get smoothly blended. If you've done this and the dip still isn't smooth, slowly stream in another tablespoon of extra virgin olive oil while the food processor is running at high speed.