Chicken/Tofu Soup

You can choose to make it veggie by adding tofu if you want.

Chicken broth/Vegetable broth
Chicken(thighs)/Tofu
Spinach
Onions
Broccoli

Boil the broth and add all the veggies and chicken at the same time and let it cook until chicken is nice and tender. If using tofu, add tofu towards the end.
Beat the egg whites and add them to the soup toward the end while stirring the soup. Add croutons if you choose.

Easy, quick and healthy!