Pat the fish fillets dry with paper towels.

In a small bowl, mix together all the ingredients for the blackening spice mix.

Rub the spice mix generously over both sides of the fish fillets.

Heat the skillet over medium-high heat and add the vegetable oil.

Once the oil is hot and shimmering, carefully place the fish fillets in the skillet.

Cook for about 3-5 minutes on each side, or until the fish is cooked through and has a blackened crust.

Remove the fish from the skillet and let it rest for a couple of minutes before serving.