Chicken Udon Noodle Soup

1 ½ (32 fluid ounce) containers chicken stock

1 clove garlic

minced

1 tablespoon minced fresh ginger root

1 teaspoon chili powder

1 large cooked skinless

boneless chicken breast

chopped

1 head bok choy

chopped

¼ cup dried shiitake mushrooms

2 (7 ounce) packages dried udon noodles

½ cup mung bean sprouts

1 green onion

sliced diagonally

2 tablespoons dried minced onion

1 tablespoon chopped fresh cilantro