Place the chicken legs into a pot, and add the miso, garlic cloves, ginger slices, green onion, onion, shiitake mushrooms and 7 cups water. Stir well to combine.
Close the lid.
Select SLOW COOK-Low and set the time to 6 hours. Press START.
When the cooking time is done, press Cancel.
With a slotted spoon, carefully remove the chicken, garlic cloves, ginger slices, green onion, onion, and shiitakes, and place in a bowl. Set aside to cool.
Coarsely shred chicken meat into the soup, discarding the skin, bone, green onion, onion, garlic and ginger.
Press Sauté-high button.
Press Start.
Once the broth is simmer, stir in kombu, bok choy, tamari and mirin.
Cover and let cook until the bok choy is wilted and tender, 3 to 5 minutes.
Remove and discard the kombu.
Once the soup boils, divide the noodles among 4 bowls, and ladle the soup on top.
Top each with sliced green onion, a halved soft-boiled egg or more, sesame seeds, sesame oil, sliced shiitake mushroom and a couple of pieces of nori.