Chicken with tenders

2 tablespoons butter 2 tablespoons olive oil 6 boneless skinless chicken breasts 1 cup fine chopped onion 1/2 cup fine chopped celery 8 ounces button[...]

2 -4 tablespoons oil 1 large onion , chopped 1 small red bell pepper , chopped 1 tablespoon chopped fresh garlic (or more to taste) 6 -8 boneless chicken[...]

1 leftover chicken carcass, with meat water , to cover 1 -2 garlic clove 1 medium onion , chopped 2 carrots , sliced in coins 1 -2 small zucchini , sliced in[...]