Add all of the ingredients (through the ginger) to the slow cooker and mix to combine. Cook on high for 4 hours or low for 8 hours.
Add the bok choy and noodles and cook on low for 3-5 minutes (see notes).
Stir and make sure the noodles are cooked through. Taste and adjust the seasonings as needed.
Ladle into bowls and top with green onion, sesame seeds and chili oil.
