Crumble beef into pan; add chopped onion. Cook over medium heat,
stirring and pressing with back of spoon to break up, until onions are
translucent and the beef no longer pink. Remove any excess fat from
pan. Add chili powder, salt, corn, and tomato sauce; heat to a
simmer; cover and continue simmering over very low heat 5-10 minutes
longer, stirring occasionally. Serve over rice.