Blackened Mahi Mahi Recipe

Fresh mahi mahi fillets are coated in bold Cajun-style spices, pan-seared until golden and slightly charred, and finished with a squeeze of fresh lime juice. Perfect for a healthy weeknight dinner, this dish pairs beautifully with rice, roasted vegetables, or tucked into tacos for a smoky, spicy twist.

If you’re looking for a bold, flavorful fish recipe that’s quick enough for a busy weeknight, this blackened mahi mahi recipe is a must-try. Mahi mahi is a firm, lean white fish that takes on seasonings beautifully, especially when paired with a smoky Cajun-style spice crust. With just a few pantry spices, a hot cast-iron skillet, and about 15 minutes of cooking time, you can have a restaurant-quality dinner on the table.

Fish not your preference? Try my viral blackened chicken recipe with pan sauce!

Why You’ll Love This Blackened Mahi Mahi Recipe

• Fast and flavorful – The fish filets cook in just 3–4 minutes per side, making this an easy recipe for weeknights.
• Healthy and versatile – Lean, high-protein white fish pairs well with rice, veggies, or tacos.
• Customizable heat – Adjust the cayenne pepper to make it as mild or spicy as you like.
• Works in many dishes – Serve it with mango salsa, over white rice, or in corn tortillas for fresh fish tacos.

This has quickly become my favorite way to prepare mahi mahi at home.

Ingredients for Blackened Mahi Mahi

When it comes to this mahi mahi recipe, you don’t need anything complicated. Here’s what to gather:

Fish Preparation

• Fresh mahi mahi fillets, skin removed (or substitute snapper, cod, or another firm white fish)
• Olive oil, avocado oil, or melted butter for coating

Spices

• Paprika, garlic powder, onion powder
• Cayenne pepper, black pepper, kosher salt
• Dried thyme and oregano (or swap in Italian seasoning if that’s what you have)

Finishing Touches

• Fresh lime or fresh lemon juice
• Optional garnishes: pineapple mango salsa, brussels sprout slaw, cilantro, or creamy poblano sauce

These simple ingredients create their own spice blend that tastes even better than store-bought Cajun seasoning.

How to Make Blackened Mahi Mahi

Wondering exactly how to make blackened mahi mahi at home? Here’s the best way:

1. Pat the fish dry – Use paper towels to remove extra moisture so the spices stick.
2. Mix the spices – In a small bowl, combine paprika, garlic powder, onion powder, cayenne pepper, thyme, oregano, salt, and black pepper.
3. Season the fillets – Brush both sides with olive oil or avocado oil, then coat generously with the spice blend.
4. Heat the skillet – Place a cast-iron skillet or large skillet over medium-high heat until hot.
5. Cook the fish – Sear each filet for 3–4 minutes per side, until blackened and flaky (internal temperature 137–140°F).
6. Finish with citrus – Add a squeeze of fresh lemon juice or lime juice right before serving.

In less than 15 minutes, you’ll have a perfectly cooked fish recipe that tastes incredible.

Blackened Seasoning for Mahi Mahi

The secret to this recipe is the seasoning. A great blackened seasoning recipe balances smoky, savory, and spicy flavors. Paprika gives color and depth, while garlic and onion powder provide savoriness. Dried thyme and oregano add earthy notes, and cayenne pepper brings a kick of heat.

If you prefer, you can use pre-made Cajun seasoning, but making your own spice blend allows you to control the heat level and salt content.

Tips for Cooking the Best Blackened Mahi Mahi

Everyone has their favorite way to cook fish, and here are three delicious ways you can prepare this recipe:

• Pan-Sear: Heat a cast-iron skillet over medium-high heat, sear the fish for 3–4 minutes per side until blackened, and finish with a squeeze of fresh lemon juice.
• Air Fryer: Brush the fillets with olive oil or avocado oil, coat with seasoning, and cook in a preheated air fryer at 400°F for 8–10 minutes, flipping halfway, until the fish flakes easily.
• Grill: Preheat the grill to medium-high heat and oil the grates well. Grill the fish for 3–4 minutes per side until lightly charred. Delicious when paired with mango salsa or Mexican street corn salad.

No matter which method you choose, the best way to cook mahi mahi is to avoid overcooking so the fish stays tender and flaky.

What to Serve With Blackened Mahi Mahi

There are so many delicious ways to enjoy this dish. Some of my go-to sides include:

• White rice or cauliflower rice to balance the spice
• Pineapple Mango salsa for a sweet, fresh topping
• Grilled Esquites (Mexican street corn) for a bold, creamy side
• Roasted vegetables like zucchini or asparagus
• Corn tortillas or keto tortillas for quick blackened fish tacos
• Taco Bowls are a great way to enjoy this as well. Pair it with my Brussels sprout slaw for a fun twist.

Storage and Reheating Instructions

If you have leftovers:

• Refrigerate in an airtight container for up to 3 days.
• Reheat in a skillet over medium heat for a few minutes until warmed through. Avoid microwaving, which can dry out the fish.
• Freezing isn’t the best option — fresh mahi mahi tastes much better right off the pan or grill.

More Recipes To Try

Blackened Chicken Alfredo Pasta

Blackened Pork Chops

Air Fryer Catfish Nuggets

Cajun Crawfish Etouffee Recipe