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 arrange them in a single layer in the prepared baking dish.
03 - Combine olive oil, parsley, dill, chives, garlic, lemon zest, lemon juice, salt, and pepper in a small bowl.
04 - Spoon the herb mixture evenly over the cod fillets, gently rubbing to ensure even coating.
05 - Place a lemon slice atop each fillet.
06 - Bake for 15–18 minutes, until cod is opaque and flakes easily with a fork.
07 - Remove from oven and allow to rest for 2 minutes before plating.