Prepare macaroni and cheese dinner as directed on the package. Meanwhile, in a large skillet, brown ground beef and onion; drain. Stir in frozen vegetables, ketchup, water, mustard and garlic powder. Cook over medium heat 8-10 minutes or until vegetables are tender crisp, stirring occasionally. Reduce heat to low. Stir in Cheddar cheese.
Add macaroni and cheese to meat mixture; mix well. Cook 1-2 minutes or until thoroughly heated. Sprinkle with additional chees, if desired.
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