Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1-inch cubes, then chop the broccoli into bite-sized florets.
Finely mince the garlic, rosemary, and thyme.
Place the chicken breast, sweet potato cubes, and broccoli on the prepared sheet pan.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with the minced garlic, herbs, sea salt, and black pepper.
Squeeze the juice of the half lemon over the entire tray and place the squeezed lemon rind onto the pan to roast alongside the food.
Toss the vegetables and chicken thoroughly with your hands or tongs to ensure everything is evenly coated in the oil and seasonings.
Spread the ingredients out into a single layer, ensuring the chicken is not covered by vegetables.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender and golden brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.