Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the yellow potato into uniform 1-inch cubes and mince the garlic cloves finely.
In a medium bowl, toss the potato cubes with half of the olive oil, the dried rosemary, and a pinch of the sea salt and black pepper.
Spread the potatoes in a single layer on the prepared baking sheet and roast for 15 minutes.
While the potatoes are roasting, whisk together the remaining olive oil, lemon juice, minced garlic, and dried thyme in a small bowl.
Pat the chicken breast dry and coat it thoroughly with the lemon-herb mixture, seasoning with the remaining salt and pepper.
Remove the baking sheet from the oven, push the potatoes to one side, and place the chicken breast and asparagus spears on the other side.
Return the pan to the oven and roast for an additional 15 to 20 minutes, or until the chicken reaches an internal temperature of 165°F.
Allow the chicken to rest for 5 minutes before slicing to ensure the juices redistribute for maximum tenderness.