1 tablespoon vegetable oil |
1/4 cup finely chopped onion |
1/4 cup finely chopped green pepper |
1/4 cup finely chopped celery |
1 lb skinless chicken breasts or 1 lb skinless chicken thigh |
1 (3/4 ounce) package mushroom gravy mix |
2 (4 ounce) cans button mushrooms, undrained |
1 (12 ounce) can evaporated milk |