Preheat your oven to 425°F (218°C).
Pat the chicken breast dry with paper towels and season both sides with sea salt and black pepper.
Place a Dutch oven over medium-high heat and add the extra virgin olive oil.
Once the oil is shimmering, sear the chicken breast for 3-4 minutes per side until a golden-brown crust forms, then temporarily remove the chicken from the pot.
Add the halved baby potatoes, sliced carrots, and chopped yellow onion to the Dutch oven, stirring to coat them in the remaining oil and chicken juices.
Place the seared chicken back on top of the vegetables.
Tuck the garlic cloves, fresh rosemary sprigs, and fresh thyme around the chicken, and place lemon slices on top of the meat.
Cover the Dutch oven with its lid and transfer to the oven to roast for 20 minutes.
Remove the lid and continue roasting for another 10-15 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender.
Let the chicken rest for 5 minutes before slicing and serving with the roasted vegetables and pan drippings.