Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper until well combined.
Trim the woody ends off the asparagus spears and place them on one side of the prepared baking sheet, then place the cod fillet on the other side.
Drizzle the lemon-herb mixture over both the cod and the asparagus, using a pastry brush or your fingers to ensure the fish is fully coated and the spears are evenly tossed.
Bake in the center of the oven for 12 to 15 minutes, or until the cod is opaque and flakes easily with a fork and the asparagus is vibrant and crisp-tender.
Transfer the warm cooked quinoa to a plate and top with the baked cod and roasted asparagus, drizzling any remaining juices from the pan over the top before serving.