01 - Preheat oven to 400°F. Line a baking dish with parchment paper or lightly grease with olive oil.
02 - Pat the cod fillets dry with paper towels and place them evenly in the prepared baking dish.
03 - In a small bowl, whisk together olive oil, lemon juice, lemon zest, sea salt, and black pepper. Brush this marinade evenly over each fillet.
04 - Sprinkle minced shallot and capers over the fillets, then top each with a thin lemon slice.
05 - Bake for 18 to 20 minutes, or until the fish flakes easily with a fork and is opaque throughout.
06 - Remove from oven, sprinkle with additional fresh parsley if desired, and serve immediately.