Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and slice the carrots into rounds and cube the sweet potato into half-inch pieces to ensure even cooking.
In a large mixing bowl, combine the chicken breast, carrots, and sweet potatoes.
Add the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper, tossing thoroughly to coat every piece.
Arrange the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and browned.
Remove from the oven and finish with a bright squeeze of lemon juice before serving.