In a mixing bowl, combine panko breadcrumbs, grated Parmesan cheese, chopped parsley, minced garlic, lemon zest, smoked paprika, salt, and pepper.
In a separate bowl, mix together the mayonnaise and Dijon mustard until well combined.
Pat the cod fillets dry with a paper towel and season both sides with a sprinkle of salt and pepper.
Spread a thin layer of the mayonnaise mixture over the top of each cod fillet.
Generously press the breadcrumb mixture onto the mayonnaise-coated side of the fillets, ensuring they are well covered.
Drizzle a little olive oil over the crusted fillets for extra richness.
Place the cod fillets on a lined baking sheet and bake in the preheated oven for about 12-15 minutes, or until the fish is cooked through and the crust is golden and crispy.
Remove from the oven and allow to rest for a couple of minutes before serving.
Notes
Serve on a bed of sautéed spinach with lemon wedges for added freshness.