Bold, smoky, and deeply satisfying, this blackened mahi-mahi is the kind of weeknight dinner that feels like a restaurant experience without any of the fuss. The magic comes from a homemade spice blend — smoked paprika, garlic powder, onion powder, thyme, oregano, cayenne, and black pepper — pressed firmly into the fish before it hits a screaming-hot cast-iron skillet. That high-heat sear creates an intensely flavored, dark crust while keeping the interior flaky and moist, hitting that perfect 145°F sweet spot. Because the seasoning is built entirely from whole spices and the fish is cooked in avocado oil, there's nothing hidden here — no fillers, no grain-based additives, just clean, real ingredients. Grain-free eaters often have to scrutinize store-bought spice blends and sauces for sneaky starches or fillers, but mixing your own blend from scratch takes that worry completely off the table. A squeeze of fresh lime and a handful of cilantro at the end brighten everything up and balance the heat beautifully. It's a fast, flavor-packed meal that proves eating clean never has to mean eating boring.
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In a small bowl, combine the smoked paprika, garlic powder, onion powder, dried thyme, dried oregano, cayenne pepper, ground black pepper, and kosher salt. Stir until evenly mixed.
Pat the mahi-mahi fillets completely dry with paper towels. Brush both sides of each fillet with 1 tablespoon of the avocado oil, then press the spice blend firmly onto both sides of each fillet, coating evenly.
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