Preheat your oven to 400°F (200°C) and line a large sheet pan with unbleached parchment paper.
Wash the potato and carrots thoroughly; dice the potato into 1/2-inch cubes and slice the carrots into 1/4-inch thick rounds.
In a small glass bowl, whisk together the olive oil, lemon juice, lemon zest, dried rosemary, dried thyme, sea salt, and black pepper to create the marinade.
Place the chicken breast, cubed potatoes, and sliced carrots onto the prepared sheet pan in a single layer.
Pour the lemon-herb marinade over the chicken and vegetables, using your hands or a pastry brush to ensure everything is evenly coated.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices stay locked in.
Plate the sliced chicken alongside the roasted vegetables and drizzle any remaining pan juices over the top for extra flavor.