15-Minute Blackened Mahi Mahi for an Easy Spicy Seafood Dinner

If you’re short on time but craving a flavor-packed, healthy meal, this 15-Minute Blackened Mahi Mahi is the perfect seafood recipe. It’s juicy, bold, and spicy with a crisp crust and tender, flaky center—all done in one pan. Whether you’re new to cooking fish or looking for fast dinner ideas, this recipe will become a weeknight go-to.

Blackened seasoning adds a restaurant-style twist to this mild white fish, making it a hit for everything from protein-packed lunches to easy fish tacos. Plus, it’s naturally gluten-free, dairy-free, and low-carb.

You’ll also love pairing this with simple sides like our Cucumber Dill Salad or serving leftovers in Spicy Butternut Squash Sweet Potato Soup for a hearty combo.

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Why You’ll Love This Blackened Mahi Mahi Fillet

There are dozens of ways to enjoy mahi fish, but this method stands out for a few reasons:

• It’s quick: Ready in 15 minutes or less
• It’s flavorful: The blackening spice mix is smoky, spicy, and savory
• It’s healthy: Low in calories and high in protein and omega-3s
• It’s versatile: Great for bowls, tacos, salads, or a main course
• It’s foolproof: Minimal ingredients, no breading or frying

Looking for more easy seafood dinners? Try our Creamy Tuscan Salmon or Grilled Thai Chicken Skewers as tasty alternatives.

Ingredients for Blackened Mahi Mahi

For the fish:

• 4 mahi mahi fillets (about 6 oz each), fresh or thawed
• 1 tablespoon olive oil (or avocado oil)
• 1 tablespoon butter (optional for extra richness)
• Lemon wedges, for serving

For the blackening seasoning:

• 1 tablespoon smoked paprika
• 1 teaspoon onion powder
• 1 teaspoon garlic powder
• 1 teaspoon dried thyme
• ½ teaspoon dried oregano
• ½ teaspoon cayenne pepper (adjust to taste)
• ½ teaspoon black pepper
• ½ teaspoon salt

You can also use this seasoning on shrimp or chicken. Check out our Sticky Honey Gochujang Chicken for another spice-forward meal.

How to Season Mahi Mahi Fish Like a Pro

To get that rich, charred crust without a grill, a great blackening spice blend is key. Mix all the spices in a small bowl and pat the mahi fillets dry with paper towels. Generously coat both sides of each fillet with the seasoning and press it into the fish to adhere well.

Let it sit for 5–10 minutes while your pan heats. This gives the flavors time to penetrate the surface of the fish and helps form a flavorful crust during cooking.

Pro tip: You can make a larger batch of this seasoning to store in a spice jar—it also works great for Grilled Chicken Orzo Salad.

Step-by-Step: How to Make Blackened Mahi Mahi in a Skillet

1. Heat your skillet over medium-high heat until very hot. A cast iron skillet works best for a good sear.
2. Add oil to the pan, then gently lay in the fillets, seasoned side down.
3. Cook 3–4 minutes per side, depending on thickness. Don’t move the fillets while they cook so the crust forms evenly.
4. Add butter during the last minute and spoon it over the fillets for added flavor.
5. Check doneness: The fish should flake easily with a fork and be opaque throughout. Internal temperature should reach 137°F–145°F.

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Serve immediately with lemon wedges for a bright finish.

Looking for another quick stovetop dinner? Try our Creamy Marry Me Chickpeas.

Blackened Mahi Mahi in the Oven: A Foolproof Alternative

If you prefer a more hands-off method or want to avoid stovetop smoke, baking works just as well.

Oven Instructions:

• Preheat oven to 425°F
• Place seasoned fillets on a greased or parchment-lined baking sheet
• Bake for 12–15 minutes, depending on thickness
• Finish with a broil for 1–2 minutes to crisp the top

This method pairs perfectly with sheet pan sides like Roasted Stuffed Bell Peppers.

How to Grill Mahi Mahi Without Drying It Out

Grilling brings out a delicious smoky flavor and is perfect for summer meals.

Grilling Tips:

• Preheat grill to medium-high
• Brush grates with oil to prevent sticking
• Cook for 4 minutes per side
• Use foil or a fish tray if fillets are delicate

Need more grill ideas? Don’t miss our Grilled California Avocado Chicken.

What to Serve With Blackened Mahi Mahi

Balance the bold flavor of the blackened fish with refreshing or mildly sweet sides:

• Cucumber Dill Salad
• Sweet Potato Toast
• Lemon Herb Quinoa with Chickpeas
• Coconut rice or mashed cauliflower
• Avocado mango salsa or corn slaw

Add a spoonful of Coconut Curry Pumpkin Soup on the side for a cozy twist.

Easy Mahi-Mahi Dinner Ideas for Busy Weeknights

This spicy fillet can be served in so many ways:

• Over rice or quinoa bowls
• Inside tortillas for tacos
• In lettuce wraps for low-carb meals
• Chopped in a salad
• With roasted veggies for a full sheet pan meal

Use leftover fillets in High Protein Overnight Oats for a savory breakfast bowl.

Turn Your Fillets Into Spicy Fish Tacos

Chop or flake the cooked mahi and tuck it into warm tortillas with:

• Slaw (cabbage + lime juice)
• Avocado slices
• Salsa or spicy crema
• Pickled red onions
• Cilantro and lime wedges

For more taco-inspired dishes, explore our Cheesy Mexican Tortilla Casserole.

Mahi Mahi Recipes You’ll Want to Cook Next

Looking to expand your seafood rotation? Here are more reader favorites:

• Mediterranean Fish Bake
• Creamy Pumpkin Gnocchi
• Air Fryer Buffalo Cauliflower (a great side option)
• Vegetable Casserole for a meatless meal

Common Mistakes to Avoid With Mahi Fish

• Overcooking: Mahi gets dry fast. Use a thermometer or watch for flaking.
• Skipping the seasoning: Mahi is mild and needs flavor from the spice blend.
• Not drying the fillets: Moisture prevents proper searing.
• Using low heat: A hot pan is essential for blackening.

Avoid these and you’ll get restaurant-quality results every time.

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FAQs About Cooking Mahi Mahi at Home

What does mahi mahi taste like?
Mahi is a firm, white fish with a mild flavor—perfect for bold seasonings.

Can I use frozen mahi mahi?
Yes! Just thaw it completely and pat dry before seasoning.

Is mahi mahi healthy?
Very. It’s high in protein, low in fat, and a great source of B vitamins and selenium.

Can I substitute another fish?
Yes. Try halibut, snapper, cod, or tilapia with the same seasoning.

How do I store leftovers?
Store cooked fillets in an airtight container in the fridge for up to 3 days.

Kitchen Tools You’ll Need for Perfect Blackened Mahi Mahi

• Cast iron skillet or heavy pan
• Fish spatula or tongs
• Digital thermometer
• Mixing bowl for spices
• Paper towels
• Cutting board and sharp knife

Need a dessert to finish your seafood dinner? Try Pumpkin Cheesecake Cookies or Apple Crisp for a fall-inspired finale.

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