Cut Spam, onion, green onion, and Cheongyang chili pepper into bite-sized pieces.
Add oil to a pot and stir-fry the Spam.
Add onion, green onion, and minced garlic and stir-fry together.
Add chili powder and stir-fry a little more.
Pour in water or broth and bring to a boil.
Add soft tofu and boil until hot.
Season with soup soy sauce and salt.
Add Cheongyang chili pepper and boil for a moment longer.