The Cajun Secret to the Crispiest Cast-Iron Salmon

London Brazil taking a bite from a bowl of food.

With a Louisiana-born Mom, and a Texas-bred Dad, the craving for Cajun and creole is a regular occurrence. So when I want to taste the flavors of home with minimal effort, it’s this Blackened Salmon recipe that I turn to.

The fact that something THIS flavorful comes together in under 15 minutes with just a cast-iron skillet and a homemade spice blend? I still don’t fully understand it. But I’m not questioning it.

I make this for Justin and me at least twice a month, and I promise… once you try it, you’ll understand why.

Blackened salmon in a cast-iron skillet with homemade Cajun seasoning
Blackened salmon served over rice with steamed broccoli

What Is Blackened Salmon?

If you’ve ever wondered what “blackened” actually means, it’s a Cajun cooking technique made famous by Chef Paul Prudhomme in the 1980s. The idea is simple: coat your protein in a bold spice blend, then cook it in a ripping-hot cast-iron skillet with butter until the spices form a dark, crispy, almost charred-looking crust on the outside.

The spices don’t actually burn. They toast and caramelize against the heat of the cast iron, creating this incredible smoky crust while the inside stays tender and flaky. The secret? A well-seasoned cast-iron skillet and high heat. (That’s it. No fancy restaurant equipment required.)

Ingredients

Blackened salmon seasoning ingredients laid out on a board

Salmon filets – Fresh, skin-on Atlantic or sockeye salmon works best here. You’ll want about 4-ounce portions so they cook evenly. (I grab mine from the seafood counter at HEB.)

Cajun seasoning – We’re using a homemade Cajun seasoning blend, which is SO much better than the store-bought stuff. You can control the heat level and skip the excess sodium.

Butter – Unsalted butter gives you that rich, golden sear and adds flavor without burning as quickly as olive oil would at this heat. This is a MUST for that traditional Cajun flavor.

Lemon – A squeeze of fresh lemon juice at the end brightens everything up and cuts through the richness of the butter and spices. Some would say optional, but I say it’s key.

Fresh parsley – For garnish. Totally optional, but it makes the plate look SO pretty.

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Mix the spice blend.

Combine all the Cajun seasoning ingredients in a small bowl and give it a good stir so everything is evenly mixed. This takes about 30 seconds and makes enough for all five filets. If you already have homemade Cajun seasoning prepped, even better.

Cajun blackened seasoning ingredients measured out on a board

Prep the salmon.

Use a sharp knife to portion your salmon into five 4-ounce filets (if it isn’t already cut). Pat each filet completely dry with paper towels, then sprinkle the Cajun seasoning generously over both sides. Use your fingers to gently press the seasoning into the fish so it sticks.

Cajun seasoning being sprinkled over salmon fillets
Cajun seasoning rubbed onto salmon fillets

Don’t be shy with the seasoning. A generous coating is what creates that signature blackened crust. The spices mellow slightly during cooking, so what looks like a lot will be just right.

Sear in the cast-iron skillet.

Heat your cast-iron skillet over medium-high heat until it’s VERY hot (about 2-3 minutes). Add the butter and let it melt and start to foam. Place the salmon filets skin-side up in the skillet. You’ll hear a serious sizzle. That’s exactly what you want.

Blackened salmon searing in a cast-iron skillet with melted butter

Don’t move the fish once it hits the pan. Let it cook undisturbed for 3-4 minutes. That’s how you get the deep, dark, crispy crust. You’ll see smoke, and that’s totally normal with blackened cooking. Turn on your vent fan!

Flip and finish cooking.

After 3-4 minutes, use a thin spatula to carefully flip each filet. Cook for another 2-3 minutes on the second side until the salmon reaches an internal temperature of 145°F. The filets should feel firm but still have a little give when you press the top.

Blackened salmon filets finished cooking in a cast-iron skillet
A slotted spatula for fish.

A must-have for fish fans!

If you cook fish even occasionally, a fish spatula is a non-negotiable. I waited way too long to get one!

The thin, flexible blade slides right under delicate fillets without tearing them apart. Total game-changer.

Get the FISH SPATULA!

Rest and serve.

Remove the salmon from the skillet and let it rest for about 1 minute. Squeeze fresh lemon juice over the top and garnish with chopped parsley. When eating, simply peel the skin off the bottom (leaving the crispy, flavorful fat layer underneath). SO good.

Blackened salmon served over a bed of rice with steamed broccoli

Oops! What Did I Do Wrong?

My salmon doesn’t have a dark, crispy crust.

Your skillet probably wasn’t hot enough. Cast iron needs a good 2-3 minutes over medium-high heat before you add the butter and fish. Also make sure you patted the salmon completely dry before seasoning.

The spices taste burned, not smoky.

The heat was likely too high or the filets were in the pan too long. Medium-high (not high) is the sweet spot. The spices should char slightly and smell incredible, not taste bitter.

My salmon is dry inside.

It was overcooked. Pull the salmon off the heat at 140-145°F since it will continue cooking from residual heat. For salmon, slightly translucent in the very center is actually perfect.

The salmon stuck to my pan.

Two common causes: the pan wasn’t hot enough, or it wasn’t well-seasoned. Make sure the butter is fully melted and foaming before adding the fish. And let it cook undisturbed so the crust can form and release naturally.

Storage & Reheating

Store leftover blackened salmon in an airtight container in the refrigerator for up to 3 days.

To reheat, place filets in a skillet over medium-low heat for 2-3 minutes per side. (The microwave works, but you’ll lose some of that crispy crust.)

Leftover salmon is also amazing cold, flaked over a salad or tucked into fish tacos.

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4.31 from 13 votes

Blackened Salmon Recipe

By: London Brazil
This Blackened Salmon tastes like the real-deal Cajun version you'd order out, except it's made at home in one cast-iron skillet in 15 minutes. A homemade spice rub chars into a smoky, crispy crust, and since you mix it yourself, you decide exactly how much heat goes in.
Cajun blackened salmon fillets in a cast-iron skillet with lemon wedges.
Yield 5 servings
Prep 5 minutes
Cook 10 minutes
Total 15 minutes
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Equipment

Ingredients 

  • 1 ¼ pounds salmon
  • 2 tablespoons salted butter
  • 1 lemon cut into wedges

Cajun Seasoning (Blackened Seasoning)

  • 1 teaspoon paprika
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • 1 teaspoon black pepper
  • ½ teaspoon dried oregano
  • ½ teaspoon dried thyme
  • ¼ teaspoon cayenne pepper plus more to taste
  • ¾ teaspoon salt plus more to taste

Instructions 

  • Mix the spice blend. Combine the paprika, garlic powder, onion powder, black pepper, oregano, thyme, cayenne pepper, and salt in a small bowl. Stir until evenly blended.
    1 teaspoon paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon black pepper, ½ teaspoon dried oregano, ½ teaspoon dried thyme, ¼ teaspoon cayenne pepper, ¾ teaspoon salt
  • Prep the salmon. Cut the salmon into five 4-ounce filets, leaving the skin on. Pat each filet completely dry with paper towels. Sprinkle the Cajun seasoning generously over both sides of each filet and press it gently into the fish.
    1 ¼ pounds salmon
  • Sear in the cast-iron skillet. Heat a cast-iron skillet over medium-high heat for 2-3 minutes. Add the butter and let it melt until foaming. Place salmon filets skin-side up in the skillet. Cook undisturbed for 3-4 minutes until a dark, crispy crust forms.
  • Flip and finish. Carefully flip each filet and cook for another 2-3 minutes on the second side until the internal temperature reaches 145°F.
  • Serve. Remove from the skillet and let rest for 1 minute. Squeeze fresh lemon juice over the top and garnish with fresh parsley.
    2 tablespoons salted butter
Last step! If you make this, please leave a review letting us know how it was!

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4.31 from 13 votes

Notes

Storage: Store leftover blackened salmon in an airtight container in the refrigerator for up to 3 days.
Reheating: Reheat in a skillet over medium-low heat for 2-3 minutes per side to preserve the crispy crust. The microwave works but the crust will soften.
Salmon: Fresh, skin-on Atlantic or sockeye salmon works best. If using previously frozen, thaw completely and pat very dry before seasoning.
Cast-Iron Skillet: A well-seasoned cast-iron skillet is essential for achieving the signature blackened crust. Make sure it is very hot before adding the butter and fish.
Spice Level: Adjust the cayenne pepper to your preference. Start with 1/4 tsp for mild heat, or add up to 1/2 tsp for extra spice.

Nutrition

Calories: 283kcal, Carbohydrates: 1g, Protein: 22g, Fat: 19g, Saturated Fat: 6g, Polyunsaturated Fat: 4g, Monounsaturated Fat: 4g, Cholesterol: 74mg, Sodium: 230mg, Potassium: 595mg, Vitamin A: 185IU, Calcium: 14mg, Iron: 0.9mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Made this recipe?Leave a comment below!

What to serve with blackened salmon

This salmon is loaded with Cajun spice, so it plays best with something on the milder side. I love it with Instant Pot Mashed Potatoes, Bacon Wrapped Asparagus, Honey Roasted Broccoli, or Roasted Sweet Potatoes.

Want to lean into the Louisiana theme? Serve it with Cajun Dirty Rice, a side of New Orleans Shrimp and Grits for a real feast, or a dollop of Cajun Remoulade Sauce for dipping.

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Ways to use leftover blackened salmon

Leftovers are almost better the next day. Flake the salmon cold over a salad, tuck it into tacos with a little slaw and remoulade, or pile it onto a rice bowl like my Bang Bang Salmon Bowls.

More easy salmon recipes

Can’t get enough salmon? Same. These are the ones my readers make on repeat.

4.31 from 13 votes (12 ratings without comment)

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Comments

  1. I’ve never had luck getting a good crust on blackened salmon, but your recipe looks foolproof. I’m going to give this a try the next time I order fresh salmon online. Salmon is one of my favorite proteins, so I’m always looking for new recipes to try.

    Reply

  2. When baking/roasting salmon filets you don’t indicate – as you do with the skillet – whether to place filets on the lined baking sheet skin side up or down. Please clarify.

    Reply

    1. You can place them either way, but I would recommend skin side-down so the blackened seasoning stays adhered to the top when baking. Hope you enjoy the recipe!

      Reply