| 3 tablespoons bottled Italian dressing, divided |
| 1 pound boneless, skinless chicken breasts |
| 1 pound fresh white mushrooms, sliced (about 6 cups) |
| 2 plum tomatoes, diced (about 1 cup) |
| 1 large carrot, cut in matchsticks* (about 1 cup) |
| 3 green onions (scallions), sliced (about 1/3 cup) |