Heat the olive oil in a large skillet over medium heat. Add the fish to the skillet and cook for about 3 minutes on each side. You want to make sure it gets almost blackened and that the fish is cooked through, inside it should be white. Remove fish from skillet and shred with a couple forks.
In a small bowl mix the cumin, cayenne pepper and chill powder. Rub generously over the tilapia fillets on both sides.