Mix doenjang (soybean paste) and cheonggukjang (fermented soybean paste) together in a bowl.
Pour water into a pot and bring it to a boil.
Cut vegetables such as potatoes, zucchini, onion, and tofu into bite-sized pieces.
Add potatoes, zucchini, and onion to the boiling water.
Add the mixed cheonggukjang and doenjang, stirring until dissolved.
Add tofu and green onion, then simmer until heated through.
Season with garlic, chili powder, and other spices to taste.