Remove the chicken 30 minutes before cooking.
Line the La Cloche with parchment paper and coat with olive oil (about 1 teaspoon).Note: I place the La Cloche on top of a 1/2 sheetpan. You can use a stoneware dutch oven pot or stoneware baker. Add the carrots, potatoes and onion to the La Cloche. Sprinkle with the salt and pepper and drizzle 1 to 2 tablespoons extra virgin olive oil. Mix to coat.
Place the marinated chicken breasts on top of the veggies. Drizzle any drippings of remaining marinade from the bowl over the breasts. Cover the La Cloche.
Roast the chichen and veggies for 1 hour and 15 minutes.
1 hour and 15 minutes later... Remove the La Cloche from the oven.
Increase the oven temperature to 450F Degrees.
Remove the domed lid (or cover). Use a spoon to pour some of the juice on top of the breasts.
Return the uncovered cloche or dutch oven to the oven. Roast for 10 to 15 minutes until the chicken is lightly browned and reaches an internal temperature of 175F to 185F degrees.
Serve with the vegetables and spoon some of the juices over the chicken. Enjoy!