Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Dice the sweet potato into 1/2-inch cubes and thinly slice the fennel bulb into strips.
Cut the chicken breast into 1-inch bite-sized pieces for even cooking.
Finely mince the garlic clove and the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken, sweet potato, and fennel.
Drizzle with extra virgin olive oil and add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring pieces are not overcrowded.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the vegetables are golden and tender.