Quick Chicken with cauliflower

1 chicken breasts or 3 chicken tenders 1 1/2 cups frozen vegetables (broccoli, cauliflower, green beans, carrots, brussel sprouts etc) 1/2 cup fresh mushrooms[...]

3 (14 1/2 ounce) cans reduced-sodium chicken broth 1/2 medium onion , finely chopped 1 (1 lb) bag frozen mixed vegetables, i.e. broccoli-cauliflower-carrot 2[...]

2 tablespoons vegetable oil 1 medium onion , cut in thin wedges 1 lb sliced fresh mushrooms (white or crimini) 2 garlic cloves , minced 3 tablespoons mild[...]