Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the sweet potato into 1/2-inch cubes and mince the garlic clove.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, oregano, thyme, sea salt, and black pepper.
Place the chicken breast, broccoli florets, and diced sweet potatoes on the prepared baking sheet.
Drizzle the herb and lemon oil mixture over the chicken and vegetables, tossing the produce to ensure an even coating.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.