Heat your oven to 425°F and position the rack to the center. While it preheats, line a rimmed baking sheet with parchment paper or aluminum foil—this prevents sticking and makes cleanup effortless. Pat your mahi mahi fillets completely dry with paper towels. This is critical: any excess moisture prevents proper coating adhesion.

Arrange three wide, shallow bowls in front of you from left to right. In the first bowl, combine the all-purpose flour, salt, and garlic powder. Mix gently with a fork to combine and break up any clumps. In the second bowl, crack the eggs and whisk with a pinch of salt and freshly cracked pepper until completely combined and slightly frothy. In the third bowl, mix the panko bread crumbs, Parmesan cheese, minced parsley, garlic powder, salt, and pepper. Stir thoroughly so the seasonings distribute evenly throughout the crumbs. Pro tip: Use a fork for the egg wash so you don't splash yourself, and use your non-dominant hand to stay relatively clean while coating multiple fillets.

Working with one fillet at a time, dredge it in the flour mixture, coating both sides and edges. Shake off any excess flour back into the bowl. Next, place the floury fillet into the egg wash and turn it to coat completely. Finally, transfer it to the panko mixture and gently but firmly press the crumbs onto both surfaces. Make sure you're covering every inch—gaps will cook unevenly and won't be as crispy. Place each breaded fillet on your prepared baking sheet, skin-side down if the fillets still have skin. Arrange them so they don't touch each other. If you want extra-crispy coating (and honestly, who doesn't?), lightly mist the top of each fillet with a tiny bit of olive oil from a spray bottle.

Slide the baking sheet into your preheated oven and set a timer for 18-22 minutes. Baking time depends on the thickness of your fillets—thinner ones closer to 18 minutes, thicker ones closer to 22. You'll know it's done when the coating is golden-brown and crispy and the fish flakes easily with a fork. Don't open the oven door before 18 minutes, as this releases heat and can extend cooking time. When you do check, look for the fish to turn opaque white and the coating to have that beautiful golden color. The internal temperature should reach 145°F according to USDA guidelines for seafood.

Remove the baking sheet from the oven and let the fillets rest for 2-3 minutes. This allows the coating to set completely so it stays crispy when you plate it. Serve immediately while the crispiness is at its peak. The contrast between the crunchy coating and the tender, flaky fish inside is what makes this dish special.