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How to Blacken Mahi Mahi

  • Author: Jennifer
  • Prep Time: 5
  • Cook Time: 10
  • Total Time: 15 minutes
  • Yield: 2 1x


This step by step tutorial will walk you through how to blacken Mahi Mahi – from skillet to cooking oil to spices to cooking time – we’ll cover it all!



  • 2 Mahi Mahi fillets – thawed
  • 1 tsp. garlic powder
  • 1 tsp. oregano
  • 1/2 tsp. cayenne pepper
  • 1 tsp. smoked paprika
  • 1 tsp. onion powder
  • 1 tsp. cumin
  • 1/2 tsp. black pepper
  • 1/2 tsp. salt
  • 2 Tbsp. avocado oil


  1. In a small bowl, add all of the spices and stir to combine.
  2. Add the avocado oil to a cast iron skillet, and heat over medium-high heat.
  3. Generously coat both sides of the Mahi Mahi fillets with the blackening seasoning.
  4. Once the oil is hot, add the Mahi Mahi fillets and cook for 3-4 minutes on one side, then flip and cook for an additional 3-4 minutes on the other side.
  5. The fillets will be done when they reach an internal temperature of 137 degrees F. and easily flake with a fork.
  6. Remove from skillet and serve immediately.


  • Be sure to use thawed – not frozen – fillets.
  • You can use butter or ghee if you do not have access to avocado oil.
  • Category: dinner
  • Cuisine: American

Keywords: blackened Mahi Mahi, gluten-free dinner