Blackened Salmon

Blackened salmon gets its dark, smoky crust from a homemade spice rub that toasts in a very hot cast iron skillet, so the paprika, garlic and thyme toast into a crisp coating while the inside stays juicy and flaky. I make this pan seared blackened salmon with skin on fillets, pantry spices, and a little butter at the very end, and it is on the table in 15 minutes. It is one of my most reliable weeknight dinners, and you control the heat, from mild enough for kids to properly spicy.

The Ingredients That Build the Crust

All ingredients and their amounts are listed in the recipe card at the bottom of this post.

Skin On Salmon Fillets: I recommend 4 fillets, about 6 ounces each and close to 1 inch thick. Thickness matters more than weight here, because the crust needs 2 to 3 minutes in the pan, and thin tail pieces cook through before the crust is ready. I like to keep the skin on. It protects the flesh while the second side cooks and makes flipping much easier. I’ve made this with both Atlantic and wild sockeye. Sockeye is leaner and thinner, so I take it off the heat about a minute earlier.

Paprika: This is the base of the blackening spice and gives the crust its deep red, almost mahogany color. I use sweet paprika most of the time. Smoked paprika gives a more grilled, campfire flavor, and I love it in winter when the barbecue is covered in snow.

Pro Tip: Check the date on your jar. Old paprika turns brown and dusty, and the crust will look dull and taste flat no matter how well you sear it.

Cayenne and Dried Thyme: These two are what make the rub taste blackened instead of just seasoned. My original recipe did not have them, and when I tested side by side, the version with thyme had that classic Cajun herb note that readers expected. With 1/4 teaspoon of cayenne, the salmon is warm and smoky, not hot. With 1/2 teaspoon, it has a real kick. When I cook for the whole family, I season Thomas’s fillet first, then add cayenne to the rest of the bowl for the adults. If you want no heat at all, my simple pan seared salmon with garlic and lemon is a better fit.

Butter: Just 1 tablespoon, added in the last minute. It brings richness and a nutty finish, and because it goes in when the heat is lower, it never burns. If you want to take it further, a spoon of my homemade garlic butter melted on top is amazing.

How to Make This Pan Seared Blackened Salmon

Before you start: Use a cast iron skillet if you have one. It holds heat better than any other pan, so the fillets do not cool it down when they go in. Turn on your vent fan and crack a window. Blackening always makes some smoke, and that is normal.

Mix the blackening spice. I stir the paprika, garlic powder, onion powder, thyme, oregano, cayenne, salt, and pepper together in a small bowl. Mixing first means every fillet gets the same balance. If you sprinkle each spice separately, one fillet always ends up too salty and another too mild.

Dry and season the salmon. I pat the fillets very dry with paper towels, then brush the flesh side with 1 tablespoon of the oil. I press the spice mix onto the flesh and the sides, not the skin. Moisture is the enemy of a crust. Wet fish steams in the pan and the spices turn pasty instead of crisp.

Heat the large cast iron skillet properly. I heat the remaining oil in the skillet over medium high heat for about 3 minutes, until the oil shimmers and moves like water when I tilt the pan. This is the step most people rush. A pan that is not hot enough is the reason blackened salmon comes out pale and soft instead of dark and crisp.

Start skin side down. I lay the fillets skin side down and cook them for 3 to 4 minutes. The skin acts like a shield. It crisps up and lets the fish cook most of the way through gently from the bottom, while the spices wait on top.

Flip onto the spices and keep the heat up. I flip the fillets onto the seasoned side and leave the heat at medium high. This is the moment the blackening happens, so do not turn it down. In 2 to 3 minutes, the spices toast in the hot oil and rendered salmon fat and form a dark crust. Because the fish is already mostly cooked, the center stays juicy while the crust gets all the heat it needs. Do not move the fillets; the crust releases on its own when it is ready.

Finish with butter. I turn the heat down to medium, add the butter, and spoon it over the fillets as it foams. Lowering the heat first keeps the butter and spices from burning. I take the salmon off the heat at 130 to 135°F in the thickest part. It keeps cooking as it rests, and it stays silky instead of chalky. If you prefer it fully cooked, the USDA recommends 145°F.

Rest and serve. I let the fillets rest for 2 minutes, then squeeze fresh lemon over the top and add chopped parsley. The lemon cuts through the spices and wakes up the whole plate.

Recipe notes

Make a jar of the spice blend. I keep a triple batch in a small jar in my pantry. It saves me the measuring on busy nights, and it is just as good on chicken breasts and shrimp.

Finish thick fillets in the oven. For fillets thicker than 1 1/2 inches, I sear both sides as written, then move the whole skillet to a 400°F oven for 3 to 4 minutes. The crust stays crisp and the center cooks evenly.

Not a fan of salmon skin? Peel it after cooking. Skinless fillets tend to curl and break in this hot pan. Once the salmon rests, the skin slides right off with a spatula, and the fillet stays in one piece.