Crispy Blackened Mahi-Mahi (20 Minutes!)

Name: Crispy Blackened Mahi-Mahi (20 Minutes!)
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Ingredients: 12 ounces Mahi-Mahi (in two individual portions); 2 tablespoons blackened seasoning; 3 tablespoons extra virgin olive oil or coconut oil

By Marley Goldin

on May 2, 2021

last updated February 24, 2026

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5 from 14 votes

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This 3-ingredient Blackened Mahi-Mahi strikes the perfect balance of herbaceous, smoky, and a little bit of spice for a flavor-packed dinner in just 20 minutes!

Looking for a quick and flavorful way to prepare your fish? This Blackened Mahi-Mahi recipe teaches you how to transform your seasoning into a crispy outer layer of smoky and spicy perfection!

This simple pan-fried fish recipe boasts tons of flavor and requires just 20 minutes and 3 ingredients to make, a must for a busy mom with a preference for big flavor like me!

Blackening is one of my favorite ways to prepare my fish because it’s guaranteed to bring robust, savory taste with a little kick. This recipe for blackened mahi works well with any side you throw at it, or as the main event in these Blackened Mahi-Mahi Tacos.

Overhead image of 2 plates of mahi-mahi. — The flavorful seasoning blackens in the cast iron pan, creating a crispy, flavorful crust around your Mahi-Mahi.

Ingredient Highlights and Swaps for this Blackened Mahi Recipe

Blackened seasoning typically contains a blend of spices and herbs and can differ in terms of spice and salt level depending on the brand.

You can grab blackening seasoning from the store or make your own! I’ll link to my homemade blackened seasoning in the recipe card.

If you don’t have blackened seasoning and don’t feel like making it, Cajun seasoning or even Taco seasoning are good swaps.

This recipe works great for either fresh or frozen fish, so long as it’s thawed properly. The best way to thaw out frozen fish is to transfer it from the freezer to the refrigerator the night before you’re ready to eat it.

If you need to thaw it more quickly, you can seal it completely in a plastic bag and soak it in room-temperature water for about 15 minutes.

Mahi-mahi itself has a very mild flavor and meaty texture, making it the perfect blank canvas for your blackening seasoning.

The seasoning is a combo of herbaceous, spicy, and salty. Blackening infuses smokiness, too.

Everything you need to make blackened mahi-mahi including Mahi-Mahi, olive oil, and blackened seasoning. — Making a delicious blackened Mahi-Mahi requires just three simple ingredients: the Mahi-mahi, the blackened seasoning, and some olive oil.

Blackened Mahi-Mahi Tips and Tricks

How to Blacken Mahi-Mahi

Always completely dry off your fish before coating it in the spice blend. This will ensure your seasoning blend sticks and will also help to avoid any extra hot oil splatter from additional water on the fish.

The easiest way to do this is by placing your fish filets in between two paper towels and pressing down lightly.

Once you’ve dried your fish filets, add them to a shallow bowl with your blackening seasoning. Make sure to completely coat both sides of the fish with the seasoning.

Think of it almost as a breading. The seasoning will actually blacken and give you the crispy exterior with tons of smoky, complex flavor.

I highly recommend using a cast-iron skillet to get your Mahi-Mahi perfectly blackened. I use this cast-iron skillet and get that crispy blackened exterior every single time!

If you don’t have a cast iron skillet, a frying pan will do! Make sure you have a cover handy to stop any oil from splattering out and burning you.

Add your coconut or olive oil to the pan—you should have enough to coat the pan completely. Turn your stove up to medium heat and wait a minute or so for your oil to heat up.

Quick note: While handling raw fish, it’s important to make sure you wash your hands frequently and use a clean plate to transfer your cooked fish to (never re-use the plate the raw fish was resting on without washing with soap and water first).

You should hear a sizzling sound when you drop your fish into the oil. Immediately cover to avoid any hot oil splatter. Cook for 5 minutes and then check if it’s ready to flip.

You’ll know your fish is ready on that side because it will easily peel away from the skillet. If it’s stuck, it’s not quite ready. Give it another minute over medium before checking again.

Using paper towel to blot dry raw mahi mahi. — Pat the mahi-mahi with a paper towel to absorb excess moisture.

2 pieces of raw mahi mahi coated in homemade blackening seasoning. — Make sure the fish is completely coated in the blackening seasoning.

blackened mahi mahi plated with arugula and lemon wedges — When done properly, blackening the fish will transform your spice coating into a crispy outer crust.

Serving Your Blackened Mahi-Mahi

This Blackened Mahi-Mahi carries a lot of strong flavors and is best with milder sides like these Simple Roasted Potatoes or these Creamy Boursin Mashed Potatoes.

It’s also delicious with roasted veggies, over rice, between two buns in a sandwich, or in fish tacos!

Want to sharpen your kitchen skills?

How I Store and Reheat Mahi-Mahi Blackened

Cooked Mahi-Mahi will be safe to eat if covered and stored in the refrigerator for another 3-4 days after preparation. The best way to reheat it is to cover it and place it in your preheated oven at 275 °F, for about 15 minutes or until the internal temperature reaches 145°F.

You can also opt to freeze your blackened mahi-mahi for up to 3 months. Just make sure to allow it to thaw overnight in the refrigerator before following the reheating directions above.