Brown the ground beef and onion in a 3 quart saucepan over medium high heat. Drain and return beef to pan. Stir in chili powder, salt and pepper. Add water; bring mixture to a boil. Stir in macaroni and cheese, tomatoes, and corn. Simmer, uncovered over medium heat for 10 minutes, Stirring occassionally, until macaroni is tender. Stir in cheese packet and stir to coat. Serve immediately.
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