Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash the sweet potato and slice it into 1/2-inch thick rounds, then mince the garlic clove.
In a small bowl, toss the sweet potato rounds with 0.5 tbsp of olive oil, a pinch of sea salt, and black pepper.
Spread the sweet potatoes on the baking sheet and roast for 10 minutes.
While potatoes roast, rub the chicken breast with the remaining 0.5 tbsp of olive oil, minced garlic, oregano, thyme, and the remaining salt and pepper.
Remove the baking sheet from the oven, move the potatoes to one side, and place the chicken breast on the other side.
Squeeze the juice from the lemon half over the chicken and place the squeezed lemon rind on the pan to infuse more aroma.
Return the pan to the oven and roast for 18-22 minutes until the chicken reaches an internal temperature of 165°F.
While the chicken finishes roasting, steam the broccoli florets in a steamer basket over boiling water for 4-5 minutes until tender-crisp.
Slice the chicken breast and serve immediately alongside the roasted sweet potatoes and steamed broccoli.