Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Trim the tough, woody ends off the asparagus and toss them on the baking sheet with 0.5 tbsp of olive oil and a pinch of sea salt.
Pat the chicken breast dry with a paper towel and season both sides evenly with the remaining sea salt, black pepper, and dried oregano.
Heat the remaining 0.5 tbsp of olive oil in a medium oven-safe skillet over medium-high heat.
Place the chicken in the skillet and sear for 4-5 minutes until a deep golden crust forms, then flip the breast.
Place the asparagus in the oven to roast for 10-12 minutes while the chicken finishes cooking in the skillet.
If the chicken is very thick, place the skillet in the oven alongside the asparagus for the final 5-6 minutes until the internal temperature reaches 165°F.
While the chicken rests for 3 minutes, whisk together the minced garlic, lemon zest, and lemon juice in a small bowl.
Plate the chicken and roasted asparagus, drizzling the fresh lemon-garlic mixture over both before serving.