Chicken and Shiitake Mushroom Soup |冬菇鸡丝汤

Ingredients:
4 oz chicken tenders (or chicken breast)
5 dried shiitake mushrooms
4 cups of spinach
2 green onions, chopped
4 cups of water or chicken stock
Salt
White pepper powder
Corn starch
Light soy sauce
Sesame oil
Canola or vegetable oil