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 1/2-inch cubes, then chop the broccoli into bite-sized florets.
Place the chicken breast, sweet potato cubes, and broccoli florets on the prepared sheet pan in a single layer.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb mixture over the chicken and vegetables, tossing the produce gently to ensure everything is evenly coated.
Slice the half lemon into thin rounds and place them directly on top of the chicken breast to infuse it with extra zest while roasting.
Bake for 20-25 minutes until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and lightly caramelized.