01 - Preheat the oven to 400°F (200°C). Line a baking dish with parchment paper or lightly grease it.
02 - Pat the cod fillets dry with paper towels and arrange them in a single layer within the prepared baking dish.
03 - Combine olive oil, parsley, dill, chives, garlic, lemon zest, lemon juice, sea salt, and black pepper in a small bowl.
04 - Evenly spoon the herb mixture over the cod fillets, gently rubbing to ensure thorough coating.
05 - Place a lemon slice on top of each fillet.
06 - Bake for 15 to 18 minutes, or until the cod is opaque and flakes easily when tested with a fork.
07 - Remove from oven and allow the fish to rest for 2 minutes before serving.