
Mix all of the blackening spices together in a small bowl. Make sure it is blended evenly.
Brush one side of each salmon fillet generously with melted butter.
Generously spoon on the blackening seasoning.
Heat a large cast iron skillet to high heat and add the salmon fillets, buttery-seasoned side down. Cook 3-5 minutes to blacken.
Brush or drizzle on the remaining butter, then generously add more seasoning.
Flip the salmon and cook another 2-3 minutes, or until the salmon is cooked through and flaky. Serve.