Pat 1 pound salmon filets dry with paper towels.
Preheat a 12- or 14-inch nonstick skillet over medium-high heat until hot (about 1–2 minutes).
Rub the salmon all over with 1 tablespoon olive oil.
Sprinkle and rub 1 tablespoon blackened seasoning evenly over the salmon.
Place the salmon in the skillet skin-side down if the fillets have skin (if skinless, place the presentation side down). Cook undisturbed for 3–4 minutes.
Carefully flip the salmon and cook an additional 3–4 minutes, or until the salmon is opaque, flakes easily with a fork, and reaches an internal temperature of 145°F.
Remove from the skillet and let rest 1–2 minutes before serving.