Rinse the tofu noodles under running water and drain thoroughly.
Thinly slice the onion, green onion, zucchini, and spicy chili pepper.
Heat cooking oil in a pot, add minced garlic and gochujang, and sauté.
Add onion and zucchini, stir-fry together, then pour in water.
When the broth boils, add the tofu noodles and cook for 3–4 minutes.
Finish by adding the green onion and spicy chili pepper.