Easy Blackened Cod Recipe

Perfect Blackened Cod is a game-changer for quick weeknight dinners - delivering restaurant-quality results with minimal effort. This method creates a boldly seasoned, deeply browned crust while keeping the fish perfectly flaky and moist inside. As a seafood recipe developer, I've found this foolproof technique helps even novice cooks nail blackened fish on their first try.

Why You'll Love This Recipe

• Takes just 15 minutes from start to finish
• Uses simple pantry ingredients
• Creates that coveted dark crust without burning the fish
• Delivers restaurant-quality results at a fraction of the cost

If you want to add more easy cod recipes to your weekly menu, check out my Broiled Cod, Southern Breaded Cod and my How to Cook Cod Tutorial.

What you'll need to make this recipe:

Before we get to the step by step directions, a few notes about the ingredients:

Fish: the recipe calls for cod, but this blackening method can be used on almost any fish, from grouper to halibut to a rich, fatty fish like salmon. If using frozen fish, be sure to thaw and dry thoroughly before seasoning.

Brown sugar: an extra touch of brown sugar helps with caramelization and adds a balanced sweetness to the super-savory seasoning. Omit if you prefer to cook without sugar.

Full ingredient list and measurements included in the printable recipe card below.

The Secret to Perfect Blackened Cod 

The key to achieving that signature blackened crust isn't just about high heat - it's about preparation. Here's what makes this method foolproof:

1. Pat your cod fillets completely dry with paper towels. Any moisture will steam rather than sear the fish
2. Use butter instead of oil - the milk solids in butter are key to developing that characteristic blackened crust
3. Get your cast iron smoking hot before adding the fish
4. Don't overcrowd the pan - cook in batches if needed

Step by step instructions:

1. Butter and season fish

Melt butter and combine store-bought or homemade Cajun seasoning and brown sugar on a small plate. If using ready-made seasoning, I always taste a bit of the spice mixture to determine if it needs a pinch more salt to balance the flavor.

Dry fish well. Dip the top of each fillet into melted butter, then dredge in blackening seasoning on one side. (Or use a pastry brush to apply the butter to the top of your fillets, then sprinkle liberally with blackening seasoning.)

2. Sear fish

Heat a cast iron skillet over medium-high heat until very hot (4-5 minutes). Place fillets seasoning-side down and sprinkle remaining seasoning on the upper side. Cook 3-4 minutes until deeply browned (not burnt). Flip gently and cook another 1-2 minutes until fish is just cooked through

3. Garnish and serve

Serve finished blackened cod with lemon wedges and Homemade Tartar Sauce. For a quick and easy seafood sauce, add Creamy Cajun Shrimp Sauce.

How do I know when cod is done? 

The fish should be opaque and flake easily with a fork. If you're uncertain, use a fork to gently separate the flakes in the thickest part - the fish should be just opaque throughout. If using a temperature pen, it should register 145 degrees F.

My seasoning burns before the fish is done - help! 

This usually means your heat is too high. Start at medium-high - you can always lower the heat if needed. Remember that thicker fillets need slightly lower heat to cook through without burning.

Can I use oil instead of butter to blacken fish?

You can use avocado oil or another neutral, high-heat oil instead of butter. But the process of blackening fish depends on the milk solids in the butter to accelerate the "blackening" process. So try it with butter first! I think you'll like the authentic flavors.

Can I use frozen cod? 

Yes! Thaw completely in the refrigerator overnight and pat very dry before cooking. Any excess moisture will prevent proper blackening.

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