Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a small bowl, mix the lemon juice, olive oil, dried herbs, salt, and pepper.
Pat dry the chicken breast with paper towels and brush both sides with the lemon herb mixture.
Place the chicken on one side of the baking sheet.
Dice the sweet potato into uniform cubes and toss with a small drizzle of olive oil, salt, and pepper. Spread on the baking sheet.
Break the broccoli into florets, lightly coat with olive oil, salt, and pepper, and place alongside the chicken and sweet potatoes.
Roast in the oven for 20-25 minutes, turning once halfway, until the chicken is cooked through and the vegetables are tender and crisp around the edges.
If desired, broil for an extra 2-3 minutes for extra crispiness on the chicken and vegetables.
Serve hot, enjoying the bright citrus notes and aromatic herb flavors.