01 - Preheat oven to 400°F. Lightly grease a baking dish large enough to hold fillets in a single layer.
02 - Pat fillets dry with paper towels. Brush both sides with olive oil and season generously with salt and pepper.
03 - Place seasoned fillets in prepared baking dish, ensuring even spacing.
04 - Whisk together melted butter, lemon juice, lemon zest, minced garlic, and chopped parsley until well combined.
05 - Pour lemon butter mixture evenly over halibut fillets, ensuring each piece is coated.
06 - Bake 15-20 minutes until fish flakes easily with fork and appears opaque throughout. Adjust time based on fillet thickness.
07 - Transfer baked halibut to serving plates. Spoon remaining baking dish sauce over top. Garnish with lemon slices and extra parsley if desired.
08 - Serve immediately while hot, accompanied by steamed vegetables, rice, or fresh salad.