Preheat your oven to 400°F.
In a small bowl, combine the olive oil, juice of 1/2 lemon, minced garlic, chopped rosemary, salt, and pepper to create the marinade.
Place the chicken breast in a shallow dish and coat it thoroughly with the marinade. Let it sit for 10-15 minutes to absorb the flavors.
Peel and dice the sweet potato into 1-inch cubes for even roasting.
Cut the broccoli into bite-size florets. Toss the broccoli and sweet potato cubes with a light drizzle of olive oil, salt, and pepper on a baking sheet.
Place the marinated chicken breast on the same baking sheet, ensuring even spacing.
Roast in the oven for about 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly crispy on the edges.
Remove from the oven and let rest for a few minutes before serving. Enjoy your balanced and flavorful meal!