01 - Preheat the oven to 400°F. Lightly grease a baking dish large enough to arrange the fillets in a single layer.
02 - Pat the haddock fillets dry with paper towels. Season both sides evenly with salt and freshly ground black pepper. Place them in the prepared baking dish.
03 - In a small bowl, whisk together melted butter, lemon juice, lemon zest, capers, chopped parsley, and minced garlic until well combined.
04 - Pour the lemon-caper butter mixture evenly over the haddock fillets, ensuring thorough coverage.
05 - Bake in the preheated oven for 15 to 18 minutes, or until the fish flakes easily with a fork and appears opaque throughout.
06 - Remove from oven and allow to rest for 2 minutes. Garnish with lemon wedges and additional fresh parsley if desired. Serve immediately.