01 - Preheat your oven to 400°F. Line a baking dish with parchment paper or lightly grease it to prevent sticking.
02 - Gently pat the halibut fillets dry with paper towels. Arrange them in the prepared baking dish.
03 - In a small bowl, combine the melted butter, lemon juice, lemon zest, minced garlic, and finely chopped parsley. Whisk until thoroughly combined.
04 - Evenly brush the lemon butter mixture over the halibut fillets. Season the fish with sea salt and freshly ground black pepper.
05 - Bake for 12 to 15 minutes, or until the fish flakes easily when tested with a fork and appears opaque in the center.
06 - Remove the baking dish from the oven. Spoon any remaining sauce from the dish over the cooked fillets. Garnish with fresh lemon slices and additional chopped parsley, if desired. Serve immediately for best flavor.