Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry with a paper towel to ensure a golden sear.
Chop the broccoli, carrots, and bell pepper into uniform, bite-sized pieces for even cooking.
In a large bowl, toss the chicken and vegetables with olive oil, rosemary, thyme, garlic powder, salt, and pepper until well coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken isn't crowded by the vegetables.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Let the chicken rest for 5 minutes before slicing to keep it juicy.