Some of my favorite options are a dollop of sour cream and a spritz of lime. However, other delicious fajita toppings include: Sour cream (use a low fat sour cream or even Greek yogurt for a healthier option), cilantro, guacamole, pico de gallo, shredded cheese, fresh tomatoes, shredded lettuce, spinach, shredded cabbage (for a crunchier texture), and squeeze of lime.