Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper for easy cleanup.
Scrub the sweet potato and prick it several times with a fork, then place it on one side of the baking sheet.
Pat the chicken breast dry with a paper towel and rub it with half of the olive oil, sea salt, black pepper, and dried oregano.
Place the chicken on the baking sheet next to the sweet potato, then top the chicken with thin lemon slices and minced garlic.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F.
While the chicken and potato roast, steam the broccoli florets in a steamer basket for about 5 minutes until they are vibrant and tender.
Remove the baking sheet from the oven and let the chicken rest for 5 minutes to lock in the juices before slicing.
Serve the sliced lemon herb chicken with the roasted sweet potato and steamed broccoli, drizzling any remaining pan juices over the meal.