Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the red bell pepper and zucchini into bite-sized pieces, ensuring they are roughly the same size as the broccoli florets for even cooking.
Place the chicken breast on one side of the sheet pan and the chopped vegetables on the other side.
Drizzle the olive oil over both the chicken and the vegetables, then sprinkle evenly with sea salt, black pepper, rosemary, thyme, and garlic powder.
Toss the vegetables with your hands or a spatula to ensure they are well-coated in the oil and spices, and rub the seasoning into both sides of the chicken.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.