Pat the salmon fillets dry with paper towels
Season both sides with salt and pepper
Heat a skillet over medium heat
Add oil or butter to the skillet
Place the salmon skin-side down if it has skin
Cook without moving for 4 to 6 minutes
Flip the salmon carefully
Cook the other side for 2 to 4 minutes
Check that the salmon is opaque and flakes easily
Remove from the skillet
Serve immediately