Preheat a 12- or 14-inch nonstick skillet over medium-high heat until hot.
Pat the 1 pound salmon filets dry with a paper towel.
Rub the salmon all over with 1 tablespoon olive oil.
Sprinkle and rub 1 tablespoon blackened seasoning evenly over the salmon (both sides, if desired).
Place the salmon in the hot skillet skin side up if the filets have skin; if skinless, place the side you want to present down. Cook undisturbed for about 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 for a minute or two before serving.