Easy Chicken without coleslaw buns stew

1/2 tablespoon canola oil 1/2 medium yellow onion , finely chopped 1 -2 cooked boneless skinless chicken breast, cubed 1 (10 1/2 ounce) can cream of chicken[...]

3 lbs boneless skinless chicken breasts , diced 2 onions , diced 1 lb carrot , peeled and sliced 1 bunch celery , sliced water , to cover 1 tablespoon salt 1[...]

3 tablespoons butter 1 large onion , diced 1 cup diced carrot 1 bell pepper , diced (red or green) 2 stalks celery , diced (optional) 3 tablespoons flour 1[...]