Black Beans And Rice

1 large onion           
1 T oil           
1 can 14.5 oz stewed tomatoes, undrained           
1 can 16 oz black beans, undrained           
1/2 T oregano           
1/2 T garlic powder           
1 & 1/2 c instant brown rice           
cook onion until tender           
combine everything but the rice and bring to boil           
add rice and bring to boil           
reduce heat, cover and simmer 5 min           
remove from heat and let stand 5 min           
serves 8