Pat cod fillets dry with paper towels
Check for and remove any bones
Season with salt and pepper
Add optional spices or herbs if desired
Heat oil or butter in a skillet over medium heat
Place cod fillets in the pan
Cook for 3 to 5 minutes on the first side
Flip carefully
Cook for 2 to 4 minutes on the other side
Cook until the fish is opaque and flakes easily with a fork
Remove from heat
Serve immediately