Preheat your oven to 400°F and line a small baking sheet with parchment paper for easy cleanup.
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 12-15 minutes until tender and slightly charred at the tips.
While the asparagus roasts, season the chicken breast evenly with dried oregano, lemon zest, sea salt, and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
During the last minute of cooking, add the minced garlic and lemon juice to the pan, swirling to create a light sauce and spooning it over the chicken.
Plate the chicken alongside the roasted asparagus and the warm cooked quinoa, drizzling any remaining pan juices over the top before serving.