Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Halve the baby potatoes and place them on one side of the baking sheet; toss with 0.5 tbsp of olive oil and a pinch of salt and pepper.
Roast the potatoes for 10 minutes to give them a head start.
While potatoes roast, rub the chicken breast with the remaining 0.5 tbsp of olive oil, rosemary, thyme, minced garlic, salt, and pepper.
Remove the baking sheet from the oven, place the chicken and lemon slices in the center, and roast for an additional 10 minutes.
Trim the woody ends from the asparagus and add the spears to the remaining space on the sheet, tossing them lightly in the pan juices.
Roast everything for a final 10-12 minutes until the chicken reaches an internal temperature of 165°F and the potatoes are golden.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve with the roasted vegetables.