01 - Set the oven to 400°F and lightly grease a baking dish large enough to arrange the fillets in a single layer.
02 - Pat the haddock fillets dry with paper towels and place them evenly in the prepared baking dish.
03 - In a small bowl, mix the panko breadcrumbs, parsley, Parmesan cheese, paprika, salt, and black pepper.
04 - Combine melted butter and lemon juice, then drizzle the mixture evenly over the fillets.
05 - Evenly sprinkle the breadcrumb mixture over the fillets, pressing gently to help it adhere.
06 - Bake for 18 to 20 minutes, until the fish flakes easily with a fork and the topping turns golden brown.
07 - Top with additional parsley if desired and serve immediately with lemon wedges.