Cut the tofu and vegetables into bite-sized pieces.
Heat cooking oil in a pot and sauté the minced garlic.
Add onion and green onion, and stir-fry together.
Add chili powder and sauté a bit more.
Pour in water, add soy sauce and salt, and bring to a boil.
Add the tofu and remaining vegetables, and simmer for about 10 minutes.
Season to taste with salt or other seasonings as desired.