01 - Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
02 - Gently pat the cod fillets dry with paper towels. Season both sides generously with salt and freshly ground black pepper. Arrange the seasoned fillets on the prepared baking sheet.
03 - In a small bowl, whisk together the Dijon mustard and mayonnaise until thoroughly combined. Using a pastry brush, evenly coat the top surface of each cod fillet with this mixture.
04 - In a separate mixing bowl, combine the panko breadcrumbs, melted butter, chopped fresh parsley, lemon zest, garlic powder, and paprika. Mix well until all ingredients are uniformly distributed and the panko is moistened.
05 - Carefully press the prepared panko mixture onto the mustard-coated side of each cod fillet. Ensure an even layer, gently pressing to help the crust adhere firmly.
06 - Transfer the baking sheet to the preheated oven and bake for 15 to 18 minutes, or until the panko crust turns golden brown and the fish flakes easily when tested with a fork.
07 - Remove from the oven and serve the baked cod fillets hot, garnished with fresh lemon wedges on the side.