Cut the tofu into bite-sized pieces.
Add oil to a pan and fry the tofu until golden.
Prepare the sauce (soy sauce, chili powder, minced garlic, water, sugar, sesame oil, sesame seeds, green onion).
Pour the sauce over the fried tofu and simmer on medium-low heat.
When the sauce thickens, flip the tofu and continue simmering. Serve when done.