Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into uniform 1-inch pieces and place them in a large mixing bowl.
Add the broccoli florets, sliced carrots, and bell pepper strips to the bowl with the chicken.
In a small ramekin, whisk together the olive oil, lemon juice, minced garlic, rosemary, thyme, sea salt, and black pepper.
Drizzle the herb oil over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the mixture in a single, even layer onto the prepared baking sheet, making sure not to crowd the pan so the chicken can crisp properly.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately while the herbs are fragrant and the chicken is juicy.