Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, dried oregano, dried thyme, sea salt, and black pepper.
Place the chicken breast on one side of the baking sheet and the trimmed asparagus spears on the other side.
Drizzle the lemon-herb marinade over both the chicken and the asparagus, using a brush or your hands to ensure the chicken is fully coated and the asparagus is tossed well.
Bake in the center of the oven for 15 to 18 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender-crisp.
Remove from the oven and let the chicken rest for 3 minutes before slicing.
Serve the chicken and asparagus over the warmed quinoa to soak up any remaining lemon juices.