Prepare a flavorful Blackened Mahi Mahi with bold Cajun spices in under 20 minutes. This easy seafood recipe features perfectly seared mahi mahi fillets coated with a zesty homemade Cajun seasoning mix, cooked in butter and olive oil for a crispy, golden exterior. Finished with fresh lemon juice, it’s a healthy, high-protein meal ideal for weeknight dinners or special occasions. Serve with rice, vegetables, or a fresh salad for a complete, satisfying seafood dish.

Ingredients

4 mahi mahi fillets (about 6 ounces each)
2 tablespoons butter
1 tablespoon olive oil
1 lemon

Kickin’ Cajun Seasoning Mix:

1 ½ teaspoons onion powder
1 teaspoon garlic powder
1 teaspoon smoked paprika
1 teaspoon dried thyme leaves
1 teaspoon dried oregano leaves
1 teaspoon fine sea salt
½ teaspoon freshly ground black pepper
½ teaspoon cayenne pepper (adjust to taste)

Instructions

Prepare the Cajun seasoning:
In a small bowl, combine all ingredients for the Kickin’ Cajun Seasoning Mix.
Season the fish:
Pat mahi mahi fillets dry with paper towels. Generously season both sides of each fillet with the Cajun spice mix, pressing the seasoning into the fish. Wash your hands thoroughly after handling.
Cook the fillets:
Heat a large sauté pan over medium-high heat and add butter and olive oil. Once the fat is hot and shimmering, add the seasoned fillets. Cook undisturbed for several minutes until the underside is golden brown. Flip the fillets and cook until the fish is opaque and cooked through.
Finish and serve:
Squeeze fresh lemon juice over the fillets before serving. Serve immediately.

Why You’ll Love This Recipe

This Blackened Mahi Mahi recipe is packed with bold Cajun flavors and a perfectly crisp crust. It’s a quick, restaurant-quality fish dish that’s simple enough for weeknight dinners yet impressive enough for guests.

Tips

Dry the fish: Removing excess moisture ensures a crisp, flavorful crust.
Preheat the pan properly: A hot pan is key to achieving the signature blackened crust.
Don’t overcrowd the pan: Cook fillets in batches if necessary for even searing.
Adjust spice level: Reduce cayenne for a milder flavor or increase for extra heat.

Variations and Substitutions

Fish alternatives: Try cod, tilapia, or salmon using the same seasoning method.
Butter substitute: Use ghee or extra olive oil for a lighter version.
Herb variations: Add smoked chili powder or cumin for a unique flavor twist.
Citrus options: Lime juice works well as an alternative to lemon.

FAQs

Can I make this ahead of time?
It’s best served fresh. Blackened fish loses its crispy crust if reheated.

What pan works best for blackening?
A heavy cast-iron or stainless steel skillet is ideal for even heat and proper searing.

How do I know when the fish is done?
The fillet should be opaque, flake easily with a fork, and have an internal temperature of 145°F (63°C).

Serving

Serve with a side of roasted vegetables, rice, or a fresh salad. Blackened Mahi Mahi pairs well with creamy coleslaw or garlic mashed potatoes for a complete meal.

Suggestions

Garnish with chopped parsley or microgreens for color.
Serve with extra lemon wedges on the side.
Add a dollop of garlic butter or Cajun cream sauce for richness.
Pair with a crisp white wine or light beer to complement the spicy seasoning.