01 - Set the oven to 400°F. Line a baking dish with parchment paper or lightly grease with oil.
02 - Pat cod fillets dry with paper towels and arrange evenly in the prepared baking dish.
03 - Drizzle olive oil over the fillets, then season them evenly with sea salt and black pepper.
04 - Bake for 15 to 18 minutes, until the cod flakes easily and is opaque throughout.
05 - In a small saucepan over medium heat, melt butter. Add minced garlic and sauté for 1 minute until fragrant but not browned.
06 - Incorporate lemon juice, lemon zest, and capers if using. Simmer for 1 to 2 minutes, then remove from heat and stir in chopped parsley.
07 - Place baked cod on plates, spoon warm lemon butter sauce over each fillet, and garnish with lemon slices and extra parsley. Serve immediately.