Cut the chicken breast into bite-sized pieces.
Boil the brown rice noodles in hot water and rinse them in cold water.
Finely chop the garlic and green onion and prepare them.
Pour water into a pot, add chili powder, soy sauce, minced garlic, and green onion, and bring to a boil.
When the broth is boiling, add the chicken breast and cook until done.
Place the cooked brown rice noodles in a bowl and pour the broth over them.
Adjust the spiciness to taste with Cheongyang chili and black pepper.