01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease a baking dish.
02 - Pat cod fillets dry with paper towels. Arrange them on the prepared baking sheet. Drizzle with olive oil and season both sides with salt and pepper.
03 - In a small bowl, combine the softened butter, parsley, dill, chives, garlic, lemon zest, lemon juice, salt, and pepper. Mix until well blended.
04 - Spread about half of the lemon herb butter evenly over the tops of the cod fillets. Reserve the rest for serving.
05 - Bake for 12–15 minutes, or until the cod is opaque and flakes easily with a fork.
06 - Remove from oven and transfer to plates. Top each fillet with a dollop of the reserved lemon herb butter. Serve immediately.