Preheat your oven to 425°F (220°C).
Pat the chicken breast dry and place it on a baking tray.
In a small bowl, mix olive oil, lemon juice, minced garlic, chopped thyme, and rosemary. Season with a pinch of salt and pepper.
Brush the chicken breast evenly with the lemon herb mixture.
Cut the sweet potato into 1/2-inch cubes and toss with a bit of olive oil, salt, and pepper. Spread on another baking tray.
On a third tray or on the same tray if space allows, spread the broccoli florets, drizzle lightly with olive oil, and season with salt and pepper.
Roast the chicken, sweet potato, and broccoli in the oven. The chicken should take about 20-25 minutes until cooked through, the sweet potatoes about 25-30 minutes until tender with crispy edges, and the broccoli about 15-20 minutes until slightly charred and crispy.
Serve a portion with one piece of chicken, a serving of broccoli, and sweet potatoes. Enjoy your balanced, nutritious meal!