Add the Mahi fillets and the lime juice to a ziploc bag and refrigerate for 20 minutes or more to marinate.
Heat the olive oil in a frying pan to a medium heat. Sprinkle the mahi with chili powder and salt on both sides.
Add the fillets to the heated pan and saute on both sides until the fish is white and flaky throughout (about 4 minutes per side).
Notes
We used Trader Joe's frozen Mahi Mahi for this recipe. Although fresh Mahi is always best, it does freeze and thaw quite well, so don't be scared of doing this recipe with frozen fish.