Most of the time when I make this, it is when I want a lot of carbs and calories without much fuss. So my hack depends on my energy level.
Easy hacks: shredded cheese, cream, chopped ham or spicy sausage, chives, garlic and onion powder
Medium hacks: ground beef, chili, taco spices or sauce, grilled onions and garlic, diced bacon, peppers, basil, surimi, herbes de Provence
Occasional hacks: lobster, homemade pesto or rich stock, turkey (seasonal), crema, roast vegetable leftovers, fancy cheeses, shrimp, Chinese BBQ pork, beef satay, top layer of panko or good quality toasted homemade bread