Rub the oil over top of the salmon and then rub in the cajun seasoning.
Heat a large, oven-safe pan on medium heat until got. Add the salmon in, flesh-side down, and sear until golden brown - just about 30 seconds to a minute. Flip over and place into the oven.
Bake until the fish flakes easily and a temperature inserted in the middle reads 120 degrees F about 2-5 minutes depending on the thickness of your salmon. Cover and let stand for 10 minutes.