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Blackened Mahi Mahi

Blackened mahi mahi comes together in just minutes with an easy homemade seasoning blend and a few minutes under the broiler for a deliciously simple dinner.

Blackened Mahi Mahi with pineapple habanero salsa served over rice on a white plate with a fork.

We’re eating a lot of beef and pork lately having bought 1/2 a pig and cow this winter. And while both are delicious, I need to intersperse some seafood throughout the week for the sake of variety.

There’s no easier (and cost effective) way to do that than by keeping frozen wild seafood on hand from a big box store. We always have either frozen salmon, cod or mahi-mahi in the freezer.

And one of the easiest ways to prepare any of these fish that also brings big flavor is using blackening seasoning.

I’ve already shared a blackened cod recipe here so I figured it was time to share another favorite, blackened mahi mahi filets.

Pressing blackening seasoning onto mahi mahi filets on a plate.

INGREDIENTS TO MAKE BLACKENED MAHI MAHI

  • mahi mahi filets (fresh or frozen)
  • blackening spices: smoked paprika, garlic powder, onion powder, brown or coconut sugar, cayenne, salt, pepper, basil, oregano, parsley
  • avocado oil spray
  • lime wedges for serving

MAHI MAHI – If you’re able to find fresh mahi mahi, by all means grab a few filets and use that! But, if like me, the only availability is frozen, simply thaw the mahi mahi, pat dry and they’ll be ready to use for this recipe.

BLACKENING SPICES – The beauty of blackening seasoning is its flexibility to your preferences. If you like a spicy hot blackening seasoning, simply use more cayenne powder. This recipe is flavorful but not spicy as it’s written. If you have a pre-mixed blackening seasoning on hand, feel free to use that instead of blending all the individual spices together.

Broiled blackened mahi mahi in a baking dish with a half a lime.

HOW TO COOK BLACKENED MAHI MAHI

Start by preheating the broiler in the oven. The top rack should be positioned in the upper third of the oven.

Pat the filets dry and lightly spray with the avocado oil.

Mix the blackening spices together in a small bowl. Press the seasoning into the fish generously coating both sides of the filets.

Place the mahi mahi in a baking dish and broil for about 10 minutes until cooked through and flaky.

Cooking time will vary depending on the thickness of the filets so start checking around the 7-8 minute mark. The flesh should easily flake apart when it’s cooked through. Don’t overcook as mahi mahi tends to get rubbery if cooked too long.

Blackened mahi mahi filet over white rice on a plate.

BLACKENING VS. CAJUN SEASONING

These two terms are often used synonymously but there is a slight difference.

Blackening seasoning is flavorful without being overly spicy whereas cajun seasoning has much more of a kick in it from a heavier use of hot spices.

WHAT MAKES A FISH BLACKENED?

The term “blackened” is defined simply by using a set of seasonings. When cooked, the fish appears dark in color from the spices giving it a blackened appearance.

Blackened fish can be cooked in a variety of ways including seared in a skillet, grilled or baked/broiled in the oven.

Blackened mahi mahi recipe served with pineapple salsa and rice on a plate with a fork.

WHAT KIND OF FISH IS MAHI MAHI?

Mahi mahi is often called “dolphin” which can be a bit misleading. Mahi mahi is technically a “dolphinfish”, it is not at all related to the mammal, dolphin.

This tropical fish is semi-sweet yet mild in flavor. It’s often used on restaurant menus in fish tacos. Its flesh is firm, meaty and flaky, similar to halibut but often less expensive.

WHAT TO SERVE WITH BLACKENED MAHI

Blackened fish goes well with so many side dishes. You can make an easy meal of this by serving with cooked white rice and your favorite vegetable.

The savory and spicy blackening seasoning pairs really well with fruit. A fruit salsa like this pineapple habanero salsa recipe is the perfect accompaniment to the fish. The bright flavors from the salsa balance the spices on the fish and a squeeze of lime is all that’s needed to pull it all together.

Serve the mahi mahi over a salad for a lighter meal or use it as the main protein in tacos for other meal options.

For summer enjoyment, pair it with a mango black bean salad or a fresh summer corn tomato salad.

This tahini carrot salad is perfect for winter while this jicama salad can be enjoyed any time of year.

Mahi mahi filet with blackening seasoning broiled until flaky on a plate with rice and salsa.

MORE SEAFOOD RECIPES LIKE THIS:

Seared salmon with tomato corn salsa
Honey lime sablefish
Greek stuffed whole snapper
Dijon almond crusted tilapia

Blackened mahi mahi over rice.

Blackened Mahi Mahi

Yield: 2 servings
Prep Time: 5 minutes
Cook Time: 10 minutes
Total Time: 15 minutes

Blackening seasoning turns mahi mahi filets into a tasty seafood dinner. Cooked under the broiler for just a few minutes, this recipe is as easy as it is delicious.

Ingredients

  • 2 mahi mahi filets (about 6-8 ounces each)
  • avocado oil spray
  • 1 tablespoon smoked paprika
  • 1/2 tablespoon garlic powder
  • 1/2 tablespoon onion powder
  • 1 teaspoon coconut sugar (or brown sugar)
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon cayenne
  • 1/4 teaspoon dried basil
  • 1/4 teaspoon dried parsley
  • 1/4 teaspoon dried oregano
  • lime wedges for serving

Instructions

  1. Preheat the broiler in the oven.
  2. Lightly spray the fish with the avocado oil spray.
  3. Mix all the spices together in a small bowl then press into both sides of each filet until generously coated with the mixture.
  4. Place the mahi mahi in a baking dish and cook under the broiler for about 10 minutes until the fish is cooked through and flaky.
  5. Remove from the oven, serve with lime wedges.
Nutrition Information:
Yield: 2 Serving Size: 1
Amount Per Serving: Calories: 279Total Fat: 9gSaturated Fat: 1gTrans Fat: 0gUnsaturated Fat: 7gCholesterol: 149mgSodium: 715mgCarbohydrates: 11gFiber: 3gSugar: 3gProtein: 39g

This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition information can vary for a variety of reasons. For the most precise nutritional data use your preferred nutrition calculator based on the actual ingredients you used in the recipe.

DID YOU MAKE THIS RECIPE?

Please leave a comment & rating below or share a photo on Instagram and tag @runningtothekitchen

Karen Kelly

Tuesday 24th of January 2023

My New Year's resolution was to try to incorporate more fish into our diet so I tried this out on the family and they liked it. It helped that they like all the spices you used in this. It's a keeper for sure.

Molly

Monday 23rd of January 2023

The spice mix on this makes these mahi mahi fillets so tasty! Love how fast this is to make too. Winner!

Gen

Monday 23rd of January 2023

I loved this combination of spices and the bit of sweetness in the recipe - so delicious! Thank you for sharing.

Kate

Thursday 19th of January 2023

I love the great flavors in this mahi mahi!

Sara Welch

Thursday 19th of January 2023

Enjoyed this for dinner tonight and it was everything a gourmet meal should be, and then some! Turned out perfectly crisp, yet juicy and tender; easily, a new favorite recipe!

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