Preheat your oven to 400°F (200°C).
Dice the potato into small cubes and trim the woody ends off the asparagus.
In a bowl, toss the potato cubes with half of the olive oil, half of the sea salt, and half of the black pepper.
Spread the potatoes on a parchment-lined baking sheet and roast for 15 minutes.
While potatoes roast, season the chicken breast with lemon zest, rosemary, thyme, and the remaining salt and pepper.
Heat the remaining olive oil in a skillet over medium-high heat. Sear the chicken for 3 minutes per side until a golden crust forms.
Move the potatoes to one side of the baking sheet. Place the seared chicken and the asparagus on the other side.
Mince the garlic and whisk it with the lemon juice, then drizzle this mixture over the chicken and asparagus.
Return the baking sheet to the oven and roast for an additional 12-15 minutes, or until the chicken reaches an internal temperature of 165°F.
Let the chicken rest for 5 minutes before serving to ensure the juices redistribute.