Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper for easy cleanup.
Rinse the quinoa thoroughly in a fine-mesh strainer, then place it in a small saucepan with 0.5 cup of water. Bring to a boil, then reduce heat to low, cover, and simmer for 12-15 minutes until water is absorbed.
Pat the chicken breast dry with a paper towel. In a small bowl, combine the sea salt, black pepper, garlic powder, and dried oregano.
Rub the spice mixture evenly over both sides of the chicken breast.
Place the seasoned chicken and the trimmed asparagus spears onto the prepared baking sheet.
Drizzle the extra virgin olive oil and fresh lemon juice over the chicken and asparagus, tossing the asparagus lightly to ensure even coating.
Roast in the oven for 18-22 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender and slightly charred.
Remove the quinoa from the heat and fluff with a fork, stirring in the fresh lemon zest for a bright finish.
Slice the roasted chicken into strips and serve immediately over the bed of lemon quinoa with the asparagus on the side.