Preheat your oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper for easy cleanup.
Pat the chicken breast completely dry with paper towels to ensure the herb rub creates a beautiful golden crust.
In a small bowl, whisk together half of the olive oil, the lemon juice, minced garlic, thyme, rosemary, sea salt, and black pepper.
Coat the chicken breast thoroughly with the herb mixture and place it in the center of the prepared baking sheet.
Roast the chicken for 15 minutes to give it a head start on cooking.
While the chicken is roasting, trim the woody ends off the asparagus and toss the spears with the remaining olive oil.
Remove the baking sheet from the oven and arrange the asparagus and lemon slices around the chicken.
Return the pan to the oven and roast for another 10-12 minutes until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
Allow the chicken to rest for 5 minutes before slicing to ensure every bite remains juicy and flavorful.