Finely dice the onion (or grate with a cheese grater). Add onion, beef and garlic to a pan over medium heat. Cook until no pink remains. Drain any fat.
Add remaining ingredients except cheese. Bring to a boil, reduce heat to medium low and cover.
Stirring occasionally, let cook 13-17 minutes or until macaroni is cooked through (add a little bit of water if needed).
Season with salt & pepper to taste and serve warm topped with cheese.
(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)