Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and dice it into uniform 1/2-inch cubes to ensure even roasting.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, diced sweet potatoes, and broccoli florets.
Drizzle with the extra virgin olive oil and sprinkle with the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well coated in the herb oil.
Spread the sweet potatoes and chicken onto the prepared baking sheet, leaving the broccoli aside for now.
Thinly slice the half lemon and place the rounds directly on top of the chicken breast.
Roast for 15 minutes, then remove the tray and add the broccoli florets to the empty spaces.
Return to the oven for another 10 to 12 minutes until the chicken is cooked through and the sweet potatoes are tender with a golden-crisp exterior.