Slice tofu, green onion, onion, and chili pepper into bite-sized pieces.
Heat cooking oil in a pot and stir-fry minced garlic and green onion.
Add onion, chili pepper, and Korean chili powder, then stir-fry.
Pour in water and kelp broth, and bring to a boil.
Add the soft tofu and simmer briefly.
Season with salt and soy sauce.
Serve in a bowl and enjoy.