1 lb. ground beef
1/4 c. chopped onion
1 tsp. chili powder
2 1/4 c. hot water
1 (6 1/4 oz.) pkg. macaroni and cheddar dinner
1 (14 1/4 oz.) can tomatoes, chopped
1 (17 oz.) can whole kernel corn, drained

Brown ground beef and onion in 3-quart saucepan; drain. Return to pan; stir in chili powder. Add water; bring to a boil. Stir in macaroni, tomatoes and corn. Simmer uncovered, over medium heat, 10 minutes, stirring occasionally. Stir in contents of cheddar cheese mix packet; serve immediately.