Preheat oven to 425 degrees F. In a large mixing bowl, add cauliflower, lime juice, garlic, cilantro, cumin, salt and pepper. Mix to combine and let stand for 5 - 10 minutes. You can also let it marinate overnight and proceed to Step 2 the next day.Transfer cauliflower into baking dish (I used 8 x 11"), reserving the garlic and cilantro on the sides of the bowl. Bake for 15 minutes. Remove from the oven and top with reserved garlic and cilantro, and cheese. Broil until cheese is melted. Top with additional fresh cilantro and avocado. Serve hot immediately.