Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Mince the garlic cloves and chop the sweet potato into small 1/2-inch cubes to ensure they cook at the same rate as the chicken.
Slice the red bell pepper into thin strips and break the broccoli into bite-sized florets.
In a large mixing bowl, whisk together the extra virgin olive oil, minced garlic, fresh rosemary, fresh thyme, sea salt, and black pepper.
Add the chicken breast, sweet potato cubes, broccoli, and bell peppers to the bowl, tossing thoroughly until everything is evenly coated in the herb oil.
Spread the mixture in a single layer on the prepared sheet pan, ensuring the chicken and vegetables are not overcrowded to allow for proper browning.
Bake for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Let the chicken rest for 5 minutes to retain its juices before slicing and serving alongside the roasted vegetable medley.