Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the bell pepper and carrots into uniform bite-sized pieces and place them on the pan with the broccoli florets.
Place the chicken breast on the same sheet pan, ensuring there is enough space for the vegetables to roast rather than steam.
Drizzle the olive oil over the chicken and the vegetables.
In a small bowl, mix the oregano, thyme, garlic powder, sea salt, and black pepper, then sprinkle the mixture evenly over everything.
Toss the vegetables to ensure they are well-coated and rub the seasoning into both sides of the chicken.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.