Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Pat the cod fillet completely dry with paper towels to ensure the topping adheres and the fish flakes perfectly.
Trim the tough, woody ends off the asparagus spears and place them on one side of the prepared baking sheet.
Place the cod fillet on the other side of the baking sheet.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Drizzle half of the lemon-herb mixture over the cod and the remaining half over the asparagus, tossing the spears to coat them evenly.
Bake for 12 to 15 minutes, or until the cod is opaque and reaches an internal temperature of 145°F, and the asparagus is tender yet still has a slight snap.
Fluff the pre-cooked quinoa and serve it as a base for the fish and vegetables, drizzling any remaining pan juices over the top.