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 with 0.5 tablespoon of olive oil, half of the sea salt, and half of the black pepper.
Spread the asparagus in a single layer on the baking sheet and roast for 12 to 15 minutes until tender and slightly charred.
While the asparagus roasts, season the chicken breast on both sides with the dried oregano, garlic powder, lemon zest, and the remaining salt and pepper.
Heat the remaining 0.5 tablespoon of olive oil in a heavy skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 8 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the skillet from the heat, drizzle the fresh lemon juice over the chicken, and let it rest for 5 minutes before slicing.
Serve the sliced chicken and roasted asparagus over a bed of warm, fluffy quinoa.