Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the sweet potato into 1/2-inch cubes and slice the carrots into 1/4-inch rounds to ensure even cooking.
Cut the red onion into thick wedges and mince the fresh garlic clove finely.
Place the chicken breast, sweet potato, carrots, and onion on the prepared baking sheet.
Drizzle with olive oil and sprinkle with dried rosemary, dried thyme, sea salt, black pepper, and minced garlic.
Toss everything together until well-coated, then spread into a single layer, ensuring the chicken has space around it.
Roast for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and browned.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.