01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease a baking dish.
02 - Pat cod fillets dry with paper towels and arrange on the prepared baking sheet. Drizzle each fillet with olive oil and lightly season with salt and pepper.
03 - In a medium bowl, combine panko breadcrumbs, parsley, dill, lemon zest, garlic powder, 1/4 tsp salt, and black pepper. Pour in the melted butter and stir until the mixture is evenly moistened.
04 - Press the panko mixture evenly onto the tops of the cod fillets, gently pressing so it adheres.
05 - Bake for 15-20 minutes, or until the fish flakes easily with a fork and the topping is golden brown.
06 - Serve immediately with lemon wedges for squeezing over the top.