Preheat the oven to 400 degrees F. Add olive oil to a large roasting pan with a lid. Add chicken pieces and season with salt and pepper. Using your hands, coat the chicken with the oil and seasonings. Add the onion, carrots, bay leaves and rosemary.
Bake in the preheated oven, with the lid on for 20 minutes.
After 20 minutes add the potatoes, toss everything together, replace the lid and place back in the oven for 20 minutes.
After 20 minutes, remove the lid and mix thoroughly. Add salt and pepper and the peas, if using. Mix thoroughly. Place back in the oven without the lid for the final 20 minutes or until cooked thoroughly, browned and liquid reduced.
Enjoy this 1 pan dinner that is like an oven baked chicken stew!