01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Pat cod fillets dry and arrange them on the prepared baking sheet. Drizzle evenly with 1 tablespoon olive oil and season with salt and freshly ground black pepper.
03 - In a food processor, combine basil, pine nuts or sunflower seeds, garlic, Parmesan, lemon zest, and a pinch of salt. Pulse to combine. With the motor running, slowly drizzle in the 1/4 cup olive oil until a thick pesto forms.
04 - Transfer the pesto to a bowl and fold in the fresh breadcrumbs until evenly combined.
05 - Evenly spoon the pesto and breadcrumb mixture over each cod fillet, pressing gently to adhere.
06 - Bake for 18 to 20 minutes, until the fish is opaque, flakes easily with a fork, and the crust is golden brown.
07 - Serve immediately, optionally accompanied by lemon wedges.