Dinner doesn't get much easier-or tastier-than this air fryer Blackened Mahi Mahi. With bold Cajun spices and a quick cook time, this healthy seafood recipe is on the table in under 10 minutes. Use my homemade blackening seasoning, recipe included. It's fast, flavorful, and perfect for busy weeknights. No air fryer? Make it stovetop instead.
Since buying my air fryer, it's my favorite way I'm cooking fish because it is so easy and fast! This blackened mahi-mahi tastes amazing, serving with a quick lemon aioli adds brightness and creaminess, balancing out the smokey spicy flavors from the rub. Or just use a squeeze of fresh lemon.
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Why You'll Like This Recipe
- Blackened mahi mahi is fast, healthy, and an easy recipe with bold flavor.
- The air fryer delivers perfect results in minutes.
- Make it with other fish if you can't get mahi.
- Serve it simply with a squeeze of fresh lemon juice.
- Use the blackening seasoning may ways.
While creamy riced mashed potatoes are a terrific side, for a lower carb side dish try this cheesy cauliflower rice.
Recipe Ingredients
Fish
- Mahi mahi - Firm, mild fish filets hold up beautifully to bold blackening spices. Use fresh mahi if you can, or frozen fish fillets that have been fully thawed and patted dry.
- Oil - A bit of extra virgin olive oil or avocado oil helps the seasoning stick and promotes a nice crust in the air fryer.
- Avocado oil spray - A quick mist on top gives the fish a slight sheen and helps keep it moist during cooking without adding extra oil. Plus, it helps that crust develop a little better in the air fryer.
Blackening seasoning
You can make blackening seasoning as mild or hot as you want by controlling the cayenne or chipotle. Start with a very small amount if you are heat sensitive (like me) and add until you get to the heat level you want. For a shortcut, use a store-bought spice mix.
- Smoked paprika - gives the blend its signature color and rich, smoky depth. For a more traditional Cajun flavor, you can swap in sweet paprika.
- Granulated garlic powder - An essential flavor component.
- Onion powder - Adds savory intensity and balance.
- Dried thyme - For herbal notes.
- Dried oregano - Common in Cajun and Creole seasoning blends.
- Black pepper: A must have in blackened blends.
- White pepper - Work with black pepper to layer in heat and sharpness. White pepper adds a subtle complexity-highly recommended if you don't use it.
- Cayenne pepper - Delivers that classic Cajun heat. Start with a smaller amount if you're spice-sensitive and adjust to taste.
Please see the recipe card for measurements and salt.
Chef's tip: Blackened or blackening? Blackening is the seasoning blend, blackened is the technique use to blacken the fish.
Substitutions and Variations
- No mahi mahi? It's terrific on salmon, or see the FAQ section for more firm white fish options.
- Chipotle powder - Adds smoky heat and bold flavor. Not classic, but it's good.
- Brown sugar - A small amount adds subtle sweetness and helps create a crust when searing. It's not traditional in blackening blends, but it's a great addition if you enjoy a hint of caramelization.
- Use lime juice instead of lemon juice to finish the fish.
Serve air fryer mahi mahi with a side of sweet corn succotash. It's terrific with the Cajun spices.
Chef's tip: Is homemade cajun seasoning the same as blackening seasoning? Cajun seasoning is a general-purpose spice blend, while blackening seasoning is a bolder variation created for the high-heat blackening method made famous by New Orleans chef Paul Prudhomme. It's similar-but spicier and more intense. And it works for more than fish. Try it with chicken and shrimp.
Recipe Instructions
Blackened mahi mahi doesn't get any easier for a fast and terrific dinner. Note - If using frozen fillets, be sure they are completely thawed and patted dry.
- Blend the blackening spices together and put them in a jar. Pat the fish dry with paper towels.
- Pre-heat the air fryer to 385°F. When ready, place fish in the air fryer and cook for 7-8 minutes. At half way, give them another quick spray for shine and crust.
Blackened mahi mahi fillets are done when the internal temperature reaches 140°F-145°F, in 7-8 minutes, or until internal temperature reaches 140°F-145°F, in 7-8 minutes.
Chef's note: Mahi mahi is sometimes called "dolphin fish" in parts of the U.S., especially in Florida and along the East Coast. Don't worry-it's not related to dolphins, the beloved marine mammals. The name can be confusing, which is why the Hawaiian name mahi mahi is more commonly used in recipes and stores today.
Serving Suggestions
Serve blackened mahi mahi with lemon wedges, a side of simple white rice or salad. A dollop of lemon aioli is perfect for a creamy finish and good with the smoky seasoning. You can make it in 5 minutes with mayo, lemon juice, zest, garlic, and Dijon.
Sometimes I serve it with a creamy avocado sauce and lime, or this fresh mango salsa. Another option is simply melted butter, as mahi is a lean fish.
- A simple, cool, lightly dressed homemade coleslaw.
- Crunchy broccoli salad with bacon.
- Simple whipped sweet potatoes and use some of the blackening spices in them too!
Leftovers
For the best flavor and texture, enjoy leftover blackened mahi mahi within 1 to 2 days. While cooked fish can technically be stored in the refrigerator for up to 3-4 days, it tends to dry out and lose quality. Store it in an airtight container.
It makes terrific fish tacos! You just need corn tortillas, thinly sliced cabbage, lime wedges, some grated cheese, and maybe avocado. They are delicious!
Recipe FAQs
Yes! You can pan-sear it in a hot large-cast iron skillet over medium-high heat with a little avocado oil (good for high heat) or even grill it. Just be sure to use a high-smoke point oil and get your pan nice and hot to create that signature crust.
Blackening is a cooking technique where food is coated in a bold spice rub and then cooked at high heat, forming a flavorful dark crust. It's not burnt-it's packed with flavor! The seasoning is a blackening seasoning and the technique is called blackened.
Absolutely! While mahi mahi is ideal for blackening because of its firm texture and mild flavor, other fish can work too. Salmon is a great alternative with its rich flavor and meaty texture. Halibut, snapper, or grouper are also excellent choices. Cod can be used but is more delicate and may flake apart, so handle it gently, especially if using the air fryer.
Blackened fish is best served fresh, but you can prep the spice rub and coat the fish ahead of time. Store it covered in the fridge and cook when ready.
If you want to make blackened mahi mahi tacos, make it a day ahead, then shred the fish for the tacos, making a fabulous lunch or dinner.
More Fish and Seafood Recipes
For more delicious fish and seafood recipes for your seafood lovers including shrimp, scallops, halibut, salmon, and more, please check out the seafood recipe index.
Did You Make This Recipe?
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📖 Recipe
Blackened Mahi Mahi (Air Fryer Recipe)
Equipment
- 6 quart air fryer
Ingredients
Fish
- 1 ½ pounds mahi mahi filets (4 - 6 ounce filets) see substitutes below
- avocado oil spray
Blackening seasoning (makes ½ cup)
- 2 tablespoon smoked paprika or sweet paprika, traditional
- 1 tablespoon granulated garlic powder
- 1 tablespoon onion powder
- 2 teaspoons dried thyme
- 2 teaspoons dried oregano
- 2 teaspoons ground black pepper
- 1 teaspoon white pepper optional but adds depth
- ¼-1/2 teaspoon cayenne pepper use more for spicy or omit for heat sensitive, or swap chipotle powder
Instructions
- Add all of the blackening seasoning ingredients to a jar and shake well to blend.
- Cut the mahi mahi into 4 equal 6-ounces filets. Give them a quick spray of avocado oil and cover the tops with blackening seasoning.
- Ready the air fryer, setting it to to 385°F. Give the rack a quick spritz of oil if needed. Add the mahi mahi when the air fryer is ready and cook for 7-8 minutes or until the mahi reads 145°F with a digital thermometer. Remove from the air fryer and serve right away with wedges of lemon.
Notes
- Salmon - Rich and meaty, holds together well and takes on bold seasoning beautifully.
- Halibut - Mild, firm, and slightly sweet. Great texture, though a bit pricier.
- Cod (loin cut) - Mild and flaky but still firm enough for this recipe if handled gently as it falls apart easily.
- Snapper - Red snapper; lean with a nice texture and mild flavor.
- Grouper - Similar to mahi in firmness and mildness, terrific if you can get it
Nutrition
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Porsche Guy says
This was so incredibly easy and tasted great! Love the blackening blend and will try it on other things. Did some of the creamy avocado sauce with it.