In a medium sized pot over medium heat, cook onions in oil for about 2 minutes (or until translucent-ish).
Add gochujang and red curry paste and fry, stirring to coat the onions and breaking up the red curry paste.
Add coconut milk and stir to incorporate the gochujang and curry paste.
Add water, mushroom broth powder, and tamari and let come to simmer.
Add the ramen noodle cakes and press down gently to submerge them in water and cook. Once softened, add the bok choy and cook until everything is tender.
In the final minute or two, add the cheddar cheese slices and stir to incorporate into the sauce. You should have a really nice, rich creamy sauce. If you find it too thick, add some broth (or in my case, water + mushroom broth powder) to thin it out.
Garnish with fried tofu, edamame, and/or toasted sesame seeds if desired.
Serve immediately!