Trim the roots off the enoki mushrooms and rinse them under running water.
Cut the onion and green onion into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the green onion first to make scallion oil.
Add the onion and stir-fry, then add gochujang, chili powder, soy sauce, minced garlic, sugar, and black pepper to make the seasoning sauce.
Add the enoki mushrooms and braise over medium-low heat until the seasoning is well absorbed.
Add Cheongyang chili peppers for extra spiciness as desired.
Transfer the finished Spicy Braised Enoki Mushrooms to a plate and serve.