Preheat the oven to 400°F
Line a baking sheet with parchment paper or lightly grease it
Pat the cod fillets dry with paper towels
Place the cod on the baking sheet
Drizzle with olive oil or melted butter
Season with salt and black pepper
Add optional seasonings like garlic, paprika, lemon juice, or herbs
Bake for 10 to 15 minutes, depending on thickness
Check that the cod flakes easily with a fork
Remove from the oven
Serve immediately