Begin by preheating your oven to 400°F (200°C). While the oven is heating, line a baking sheet with parchment paper to ensure an easy cleanup.
In a medium mixing bowl, combine the freshly grated Parmesan cheese, panko breadcrumbs, chopped parsley, lemon zest, garlic powder, onion powder, and a generous sprinkle of salt and pepper. Stir well until all the ingredients are thoroughly mixed to create a flavorful topping.
Take the cod fillets and pat them dry with paper towels, this will help the crust adhere better. Place each fillet on the prepared baking sheet, ensuring they have a bit of space between them.
In a small bowl, mix together the extra virgin olive oil and melted unsalted butter until combined. Using a brush, evenly coat the top of each cod fillet with this mixture, which will add richness and help the crust to become crispy.
Sprinkle the Parmesan and breadcrumb mixture generously over each fillet, pressing down gently to ensure it sticks well and forms a hearty crust.
Place the baking sheet in the preheated oven and bake for 12-15 minutes. Keep an eye on the fish; it is ready when it turns opaque, flakes easily with a fork, and the crust turns a delightful golden brown.
Once done, remove from the oven and serve immediately. Accompany the cod with lemon wedges on the side, allowing diners to squeeze fresh lemon juice over the fish for an invigorating burst of flavor.