Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry with paper towels to ensure a crispy finish.
In a small bowl, combine half of the olive oil with the sea salt, black pepper, dried oregano, garlic powder, and lemon juice.
Rub the herb mixture evenly over both sides of the chicken breast.
Place the chicken on the baking sheet and arrange the lemon slices around it.
Toss the asparagus spears with the remaining olive oil and a pinch of salt, then set aside.
Roast the chicken for 15 minutes, then add the asparagus to the baking sheet.
Continue roasting for another 10 to 12 minutes until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
Serve the roasted chicken and asparagus over a bed of warm, fluffy quinoa.