Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Halve the baby potatoes and trim the woody ends off the asparagus spears.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, whisk together the olive oil, the juice and zest from the half lemon, minced garlic, sea salt, black pepper, and herbs.
Add the chicken breast, potatoes, and asparagus to the bowl and toss thoroughly until everything is evenly coated in the vibrant marinade.
Arrange the ingredients in a single layer on the prepared sheet pan, ensuring the chicken isn't crowded by the vegetables.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender and golden.
Let the chicken rest for 5 minutes before slicing to keep it juicy.