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 them on the baking sheet with 0.5 tbsp of olive oil, a pinch of sea salt, and black pepper.
Season the chicken breast evenly on both sides with the dried oregano, remaining sea salt, and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a large oven-safe skillet over medium-high heat.
Place the chicken in the skillet and sear for 3-4 minutes until a golden-brown crust forms, then flip the breast.
Place the asparagus in the oven and transfer the skillet with the chicken to the oven as well.
Roast both for 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
While the chicken rests for 2 minutes, whisk together the lemon juice, lemon zest, and minced garlic in a small bowl.
Drizzle the lemon-garlic mixture over the chicken and asparagus before serving hot.