Oven-baked blackened Mahi Mahi is a delicious sheet pan dinner recipe that’s super easy to bake. The fresh Mahi Mahi fillets cook up nice and flaky with a tasty homemade blackening spice mix; no need for high heat or smoky kitchens! You’ll find this Mahi Mahi recipe and more in our Mahi Mahi Recipes collection.

Blackened Mahi Mahi has incredible flavor! You can eat it alone, or use it in blackened Mahi Mahi tacos. But, knowing how to easily blacken Mahi can sometimes be challenging. For example, in my tutorial How to Blacken Mahi Mahi, I walk you through step-by-step on how to blacken Mahi using high heat and a cast iron skillet. This method ensures you get a nice crispy blackened crust, however, it can also leave you with a smoky kitchen!

If you aren’t comfortable cooking with cast iron, or do not own any cast iron skillets, that tutorial wouldn’t work for you. But, you can blacken Mahi Mahi using just a simple sheet pan and your oven! This recipe will walk you through how to easily blacken Mahi in the oven

Ingredients needed

• 4 Mahi Mahi fillets – thawed
• 3 Tbsp. olive oil
• 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

How to blacken Mahi Mahi

1. Preheat oven to 450 degrees F.
2. Line a sheet pan with foil and coat with 3 Tbsp. of olive oil.
3. Lay the thawed Mahi Mahi fillets onto the oil.
4. In a small bowl, combine the blackening spices and mix to combine.
5. Thoroughly coat both sides of the Mahi Mahi fillets with the seasoning mixture.
6. Bake for 10-12 minutes or until flaky, and the internal temperature reaches 137 degrees F.
7. Remove from oven and serve immediately. Serve with your favorite aioli, like this roasted chili aioli, or remoulade sauce.

Recipe FAQs and Variations

Is blackened fish burnt?

No! It may look burnt, but the blackened color is actually the charred spices combined with the cooking oil.

Is blackened seasoning hot?

This blackened seasoning in particular does carry a little kick of heat, but it’s not intolerable.

Will blackened Mahi Mahi get crispy in the oven?

While you’ll still get the delicious flavors of blackened Mahi in the oven, you won’t get a crispy outside crust when oven-baking. To get that crust, you’ll need to pan sear, which I show you how to do in my how to blacken Mahi Mahi tutorial.

Cooking Mahi Mahi just got easy!

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Having a good quality sheet pan is such an important kitchen essential. I also like to keep an instant read thermometer on hand for food cook-temp safety. You can also make a large batch of the blackening seasoning and store in one of these reusable spice jars.

Make it a meal with these additional recipes!

Make it a full meal by adding these recipes to your menu – Easy air fryer roasted potatoes are a super easy side dish that can cook up in the air fryer while the Mahi Mahi is cooking in the oven. Or, if you want a lighter side dish, the sweet and spicy mix in this spicy cucumber salad recipe would pair deliciously with the blackened seasoning. Then top it off with this easy make-ahead dessert – vanilla panna cotta with white wine sauce. And, if you’re hosting guests, treat them to a La Croix Paloma or Easy Berry Mojito!

Blackened Mahi Mahi Recipe