Turn the rice cooker on and put the oil in. Add the diced onion and stir for a few minutes, then add the garlic and cook another minute, stirring.
Add the rice and cook 5 - 10 minutes, stirring, until lightly golden. Add the tomato, stir and cook a few more minutes. .
Add the water, chili powder and salt. Reset the rice cooker to start the normal rice cooking mode.