Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Trim the woody ends off the asparagus and place them on the baking sheet. Drizzle with half of the olive oil and toss with one minced garlic clove, a pinch of salt, and pepper.
Roast the asparagus for 12-15 minutes until tender and slightly charred.
While the asparagus roasts, season the chicken breast on both sides with the dried oregano, thyme, lemon zest, remaining salt, and pepper.
Heat the remaining olive oil in a large skillet over medium-high heat. Add the chicken breast and sear for 5-7 minutes per side until golden brown and the internal temperature reaches 165°F.
During the last minute of cooking the chicken, add the remaining minced garlic to the skillet and sauté until fragrant, then pour in the lemon juice to deglaze the pan.
Remove the chicken from the heat and let it rest for 3 minutes before slicing.
Serve the sliced chicken over the cooked quinoa with the roasted asparagus on the side, spooning any remaining pan juices over the top.