Heat sesame oil in a wok or large skillet on medium-high heat. If you are using uncooked pork belly, add to skillet now and cook until seared on the outside (1-2 minutes). I like to use cooked chashu as I think that brings a deeper flavor to the broth so I usually add the cooked chashu with the rest of the seafood.
Add cooked chashu pork (if previously cooked), squid, shrimp, onion, and 1 Tbsp. of soy sauce to the wok and cook until shrimp and squid are cooked.
Next, add carrots and cook for one minute, stirring frequently.
Add mushrooms, cabbage, and kamaboko and cook for one minute, stirring frequently.
Then, add bean sprouts and cook for an additional minute, stirring the mixture frequently.
Pour the simmering broth into the meat and vegetable mixture and stir to combine. Lower heat to simmer and add the cream to the champon.
Add roughly 1/6 of the soup toppings and broth to the noodle bowl.
Serve and enjoy!