Rinse the quinoa under cold water and combine with 0.5 cup of water in a small saucepan; bring to a boil, then reduce heat to low, cover, and simmer for 12-15 minutes until fluffy.
Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Trim the woody ends off the asparagus and toss the spears on the baking sheet with 0.5 tbsp of olive oil, a pinch of sea salt, and black pepper.
Roast the asparagus for 10-12 minutes until tender and slightly charred at the tips.
While the asparagus roasts, season the chicken breast with the dried oregano, remaining sea salt, and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a medium skillet over medium-high heat and sear the chicken for 5-7 minutes per side until the internal temperature reaches 165°F.
In the final minute of cooking, add the minced garlic, lemon juice, and lemon zest to the skillet, spooning the pan juices over the chicken to create a bright glaze.
Plate the fluffy quinoa alongside the roasted asparagus and the lemon-herb chicken, drizzling any remaining pan sauce over the top.