01 - Set oven temperature to 400°F and line a baking sheet with parchment paper.
02 - Pat the cod fillets dry, place them on the prepared baking sheet, drizzle with 1 tablespoon olive oil, and season with salt and freshly ground black pepper.
03 - In a food processor, combine basil leaves, pine nuts (or sunflower seeds), garlic, grated Parmesan, lemon zest, and a pinch of salt. Pulse to combine; then, with the motor running, slowly add olive oil until a thick pesto forms.
04 - Transfer pesto to a bowl and fold in fresh breadcrumbs until evenly incorporated.
05 - Spoon the pesto and breadcrumb mixture evenly over each cod fillet, pressing gently to adhere.
06 - Bake for 18 to 20 minutes until the cod is opaque, flakes easily with a fork, and the crust has turned golden.
07 - Serve immediately, optionally garnished with lemon wedges.