Quick Chicken with carrot

2 tablespoons olive oil 1 pound skinless, boneless chicken breast halves - cut into bite-size pieces 2 cloves garlic, minced 1 medium onion, cut into 1/2-inch[...]

4 -6 chicken thighs 2 (14 1/2 ounce) cans diced tomatoes 1 medium onion , coarsely chopped 1 stalk celery , sliced 1 carrot , sliced 1/2 green pepper 1/2[...]