01 - Preheat oven to 400°F. Line a baking dish with parchment paper or lightly grease it.
02 - Pat cod fillets dry with paper towels and place them in a single layer in the prepared dish.
03 - In a small bowl, whisk together olive oil, parsley, dill, chives, garlic, lemon zest, lemon juice, sea salt, and black pepper.
04 - Spoon the herb mixture evenly over the cod fillets, gently rubbing to ensure full coverage.
05 - Place a lemon slice on top of each fillet.
06 - Bake for 15 to 18 minutes until the cod is opaque throughout and flakes easily with a fork.
07 - Remove the dish from the oven and allow the cod to rest for 2 minutes before plating.