Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Wash and halve the baby potatoes, and trim the woody ends off the asparagus spears.
Mince the garlic, rosemary, and thyme, then slice the half lemon into thin rounds.
Pat the chicken breast completely dry with a paper towel to ensure the skin gets crispy.
In a small bowl, combine the olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper.
Rub half of the herb-oil mixture all over the chicken breast, including under the skin.
Toss the potatoes with the remaining herb-oil mixture and place them on the baking sheet with the chicken.
Roast for 15 minutes, then remove the pan to add the asparagus and lemon slices.
Return to the oven for another 10-12 minutes until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy.