Yes: Cheese- add a sprinkle of your favorite shreds! Cheddar, mozzarella, and even pepper jack will taste great. Or add some goat cheese, feta, or parmesan! Protein- grilled chicken, bacon, tuna, shrimp, or sirloin steak are great protein options. Diced eggs would also be great! Herbs- chopped oregano, dill, or cilantro are refreshing and add a pop of color and vibrant flavor.