01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pat cod fillets dry with paper towels. Season both sides with salt and pepper. Arrange fillets on the prepared baking sheet.
03 - In a small bowl, combine the Dijon mustard and mayonnaise. Brush the top of each fillet with the mixture.
04 - In another bowl, mix together panko breadcrumbs, melted butter, parsley, lemon zest, garlic powder, and paprika until well combined.
05 - Press the panko mixture evenly onto the mustard-coated side of each fillet, gently pressing to adhere.
06 - Bake for 15–18 minutes, or until the crust is golden and the fish flakes easily with a fork.
07 - Serve immediately with lemon wedges.