Coat the catfish fillets in the blackened seasoning and salt.
Preheat a cast-iron skillet over medium heat and add the butter.
Add the catfish filets to the melted butter and cook for 5 minutes. Carefully flip the catfish over and cook on the other side for 5 minutes until the flesh is flaky.
Remove from heat and serve hot.
Notes
You want to use enough blackened seasoning to coat all sides of the fish.
The seasoning tends to smoke when cooking, so it is best to turn on a fan and/or open a window to prevent the smoke alarm from going off. If the pan starts to smoke too much while cooking, add an additional 1-2 tablespoons of butter and reduce the heat just slightly.
The catfish can be substituted with other types of fish or seafood like catfish (see post above for examples of fish that can be used).
You can also place the skillet on a grill to heat it to avoid smoking out your house.