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.
Finely mince the garlic, rosemary, and thyme, mixing them together in a small bowl.
In a medium bowl, toss the halved potatoes with half of the olive oil and a pinch of the salt and pepper.
Spread the potatoes onto the baking sheet and roast for 10 minutes to give them a head start.
While potatoes roast, rub the chicken breast with the remaining olive oil, minced herb-garlic mixture, lemon juice, and the remaining salt and pepper.
Remove the sheet pan from the oven, move the potatoes to one side, and place the chicken and asparagus on the other side.
Return the pan to the oven and roast for an additional 18-20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden brown.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.