Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Halve the baby potatoes and place them on one side of the sheet pan, tossing with 0.5 tbsp of olive oil, half the salt, and half the pepper.
Roast the potatoes for 10 minutes to give them a head start on becoming perfectly tender.
While potatoes roast, whisk together the remaining olive oil, lemon juice, lemon zest, minced garlic, thyme, and rosemary in a small bowl.
Remove the pan from the oven and add the chicken breast and trimmed asparagus spears to the empty side.
Brush the lemon-herb mixture generously over both the chicken and the asparagus, then sprinkle with the remaining salt and pepper.
Return the pan to the oven and roast for 15-20 minutes, or until the chicken reaches an internal temperature of 165°F.
Let the chicken rest for 5 minutes before slicing to ensure every bite remains juicy and flavorful.