Blackened Mahi Mahi

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Spice up your seafood with our blackened Mahi Mahi recipe. A filet of fish topped with our homemade Cajun seasoning then cooked to perfection!

A blackened mahi mahi filet on a square plate.

Cajun Mahi Mahi

4.5 from 52 votes
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Author: Kim
Prep Time: 10 minutes
Cook Time: 12 minutes
Total Time: 22 minutes
Servings: 4 Servings

Ingredients

  • 2 teaspoons garlic powder
  • 1 ½ teaspoons onion powder
  • 1 ½ teaspoons smoked paprika
  • 1 teaspoon dried oregano
  • 1 teaspoon salt
  • 1 teaspoon dried thyme
  • ½ teaspoon ground black pepper
  • ¼ teaspoon cayenne pepper, or to taste
  • 1 pound mahi mahi fillets
  • 2 tablespoons unsalted butter
  • 2 tablespoons olive oil

Instructions
 

  • In a small bowl, combine the garlic powder, onion powder, smoked paprika, oregano, salt, thyme, pepper, and cayenne.
    2 teaspoons garlic powder
    1 ½ teaspoons onion powder
    1 ½ teaspoons smoked paprika
    1 teaspoon dried oregano
    1 teaspoon salt
    1 teaspoon dried thyme
    ½ teaspoon ground black pepper
    ¼ teaspoon cayenne pepper
  • Pat the fish filets dry with a paper towel, and sprinkle both sides with the Cajun seasoning mix. Rub the seasoning into the fish, and ensure the fish is evenly coated.
    1 pound mahi mahi fillets
    2 tablespoons unsalted butter
    2 tablespoons olive oil
  • Heat a large skillet over low to medium heat. Add the butter and oil and use a wooden spoon or whisk to combine. Add the fish, and cook for 4 to 6 minutes on each side. The fish should be opaque and flake easily with a fork. An instant read thermometer should read 145°F when inserted into the thickest part of the filet.
  • Remove the mahi mahi from the pan to a waiting plate. Serve hot with lemon wedges, a side salad, and rice.

Notes

*This recipe is quite spicy. To make the dish less spicy, reduce or omit the cayenne pepper and consider reducing the paprika and black pepper. Paprika is not typically heavy in heat, but in large amounts, it may add “spice” to some dishes.
 
*The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 4-ounces of blackened Mahi Mahi. Actual calories may vary.

Nutrition

Serving: 0.25poundCalories: 221kcalCarbohydrates: 3gProtein: 22gFat: 14gSaturated Fat: 5gPolyunsaturated Fat: 1gMonounsaturated Fat: 7gTrans Fat: 0.2gCholesterol: 98mgSodium: 684mgPotassium: 531mgFiber: 1gSugar: 0.2gVitamin A: 834IUVitamin C: 1mgCalcium: 36mgIron: 2mg
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Top-down view of the blackened mahi mahi.

Are you craving a spicy seafood dinner? Well, my friend, then look no further.

Our blackened Mahi Mahi recipe features a meaty fish filet seasoned with Kim’s custom Cajun spice mix.

The spices add a ton of heat and flavor to an already delicious piece of fish.

It should be noted that this recipe is very spicy. In fact, it was a little too spicy for me.

If that concerns you, then consider omitting the cayenne pepper and reducing the black pepper in the Cajun seasoning mix.

If this recipe sounds too spicy, you may want to try our oven baked mahi mahi, sheet pan salmon, maple Dijon salmon or baked cod with panko.

How to make Cajun seasoning?

First, grab a small bowl and a whisk. Next, add the garlic powder, onion powder, smoked paprika, oregano, salt, thyme, black pepper, and cayenne pepper to the bowl.

Last, use your whisk to combine the ingredients. The spice mix can be stored in a sealed container, in your cabinet for up to 3-months.

The fish has been cooked and plated.

What side dishes go with this recipe?

Any of these sides will pair nicely with the spicy fish.

Like this recipe?

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4.45 from 52 votes (52 ratings without comment)

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3 Comments

  1. HUGE hit with my family. Mahi Mahi is one of my daughters favorite restaurant dishes, and I’ve never tried until this recipe. Thank you!!

    1. Hi Karen!

      We’re so glad you and your family enjoyed the fish! It’s a favorite of ours, too. Have a great evening! 🙂