Preheat your oven to 400°F (200°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 clove and finely chop the fresh rosemary and thyme leaves.
In a mixing bowl, toss the halved potatoes with 0.5 tbsp of olive oil, half of the minced garlic, half of the herbs, and a pinch of salt and pepper.
Spread the potatoes onto the baking sheet and roast for 10 minutes.
While potatoes roast, rub the chicken breast with the remaining 0.5 tbsp of olive oil, the rest of the garlic, and the remaining herbs.
Remove the baking sheet from the oven; move the potatoes to one side and place the chicken breast and asparagus on the other side.
Squeeze the juice of the half lemon over the chicken and the asparagus spears.
Return the pan to the oven and roast for an additional 15-20 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 and serving with the roasted vegetables.