01 - Preheat the oven to 400°F. Lightly grease a baking dish large enough to hold the fillets in a single layer.
02 - Pat haddock fillets dry with paper towels. Season both sides with salt and black pepper. Place the fillets in the prepared baking dish.
03 - In a small bowl, combine melted butter, lemon juice, lemon zest, capers, parsley, and minced garlic. Whisk to blend.
04 - Pour the lemon-caper butter mixture evenly over the haddock fillets.
05 - Bake for 15 to 18 minutes, or until the fish flakes easily with a fork and is opaque throughout.
06 - Remove from oven and let rest for 2 minutes. Garnish with lemon wedges and extra parsley if desired. Serve immediately.