Stirfry the noodles. Add the noodles to the same pan if room, or to a second pan. Add a dash of toasted sesame oil, and a squirt of okonomiyaki sauce and stir fry the noodles. Shape into a cake approximately the same size as the okonomiyaki.
Combine noodles and okonomiyaki. Transfer the cabbage okonomiyaki on top of the noodles.
Scramble the egg. Heat another splash of oil in the pan, and crack an egg in the pan. Using chopsticks, scramble the egg slightly and spread to the same size as the pancake.
Cook the egg and flip. While still runny and uncooked, place the okonomiyaki on top of the egg. Once the egg is cooked fully, flip the pancake one more time.
Transfer to a plate. Turn the okonomiyaki out onto a plate, egg side up. If possible, it can be easiest to hold a plate up to the pan and then flip it over rather than using spatulas to transfer.
Add toppings. Top with toppings as desired. Give a healthy coating of okonomiyaki sauce, mayonnaise and bonito flakes.
Repeat. Repeat okonomiyaki and yakisoba instructions for remaining 3 pancakes.