Cut the rice cakes and fish cakes into bite-size pieces.
Finely chop the onion and garlic.
Boil the pasta noodles and set aside.
Heat cooking oil in a pan and sauté the garlic and onion.
Add the rice cakes and fish cakes and stir-fry together.
Add gochujang, red pepper powder, soy sauce, sugar, and water to make the sauce.
Add the boiled pasta noodles to the sauce and mix well.
Top with cheddar or mozzarella cheese and let it melt.
Finish by sprinkling chopped green onions on top.