Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and dice the yellow potato into 1/2-inch cubes and trim the woody ends off the asparagus spears.
In a large mixing bowl, toss the potato cubes with half of the olive oil, minced garlic, chopped rosemary, 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 roast, brush the chicken breast with the remaining olive oil and season with a pinch of salt and pepper.
Remove the sheet from the oven, move the potatoes to one side, and place the chicken breast and asparagus 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 and the potatoes are crispy.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.