Preheat your oven to 400 degrees Fahrenheit and line a large baking sheet with parchment paper.
In a small bowl, whisk together half of the olive oil, the minced garlic, lemon zest, dried oregano, sea salt, and black pepper.
Pat the chicken breast dry and rub the lemon-herb mixture evenly over both sides.
Place the chicken on the prepared baking sheet and roast for 10 minutes.
While the chicken starts roasting, trim the woody ends off the asparagus and toss the spears with the remaining olive oil and a pinch of salt.
Remove the baking sheet from the oven, add the asparagus in a single layer next to the chicken, and return to the oven for another 12 to 15 minutes until the chicken reaches an internal temperature of 165 degrees Fahrenheit.
Drizzle the fresh lemon juice over the roasted chicken and asparagus.
Serve immediately alongside the warm, cooked quinoa for a complete and balanced meal.