Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Add the diced sweet potato, broccoli florets, sliced carrots, and diced bell peppers to the bowl with the chicken.
Mince the garlic cloves and add them to the bowl along with the olive oil, dried rosemary, dried thyme, sea salt, and black pepper.
Toss all ingredients together thoroughly until the chicken and vegetables are evenly coated in the oil and seasoning blend.
Spread the mixture in a single, even layer onto the prepared baking sheet, ensuring the pieces are not overcrowded.
Roast in the center of the oven for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and let rest for 2 minutes before serving hot.