Will definitely impress others! To fill the olives, use a pastry bag or plastic baggie with the corner cut out. What works best is a cookie press. Also, you can use bottled roasted garlic, but I like to make my own.
Place cream cheese, goat cheese, Parmesan, basil, roasted garlic, and salt and pepper into a food processor; pulse until smooth and well blended. Spoon filling into a cookie press or pastry bag (a plastic baggie with the corner cut out will also work), and fill olives.