01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly oil a baking dish.
02 - Pat cod fillets dry with paper towels. Season both sides with salt and freshly ground black pepper. Arrange fillets on the prepared baking sheet.
03 - In a mixing bowl, thoroughly combine breadcrumbs, parsley, chives, dill, lemon zest, garlic, and olive oil until evenly moistened.
04 - Brush a thin layer of Dijon mustard over the top of each cod fillet.
05 - Press the herb breadcrumb mixture firmly and evenly onto the mustard-coated side of each fillet.
06 - Bake in preheated oven for 15 to 20 minutes, or until the fish flakes easily with a fork and the crust is golden brown.
07 - Remove from oven and serve immediately with lemon wedges on the side.