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 tablespoon of olive oil, a pinch of sea salt, and black pepper.
Roast the asparagus for 12 to 15 minutes until tender and slightly charred at the tips.
While the asparagus roasts, season the chicken breast on both sides with the dried oregano, remaining sea salt, and black pepper.
Heat the remaining 0.5 tablespoon of olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F.
Reduce the heat to low, add the minced garlic to the pan, and sauté for 30 seconds until fragrant.
Pour the fresh lemon juice and lemon zest over the chicken, swirling the pan to create a light pan sauce.
Plate the chicken alongside the fluffy cooked quinoa and roasted asparagus, drizzling any remaining lemon-garlic pan juices over the top.