Drizzle tilapia filet(s) with olive oil. Whisk together cumin, coriander, paprika, garlic powder, cayenne, salt and pepper in a small bowl. Rub all over fish.
Heat a heavy bottomed skillet, like a cast iron, to medium high heat. Sear seasoned tilapia for 2-3 minutes on each side until cooked through.
In a small bowl, massage shredded cabbage with salt and lime juice and set aside.
In another small bowl, whisk together the mayo or Greek yogurt with lime juice & zest, olive oil and salt.
Warm tortillas and prepare toppings. Build tacos and drizzle with lime zest dressing and enjoy immediately!