In a pot or deep skillet (to prevent spatters) add the ground beef, onion and green pepper. Cook, breaking up ground beef, until ground beef is cooked through. Drain.
Clear an area in the center of the pan, add the garlic and chili powder and heat until the mixture is fragrant. Stir into the ground beef mixture along with the salt.
Add tomatoes, water, and macaroni. Bring to a simmer, cover, and cook until noodles are al dente, about 15 minutes, stirring now and then.
Turn off the heat, add cheese to the top of the skillet and cover until cheese is melted.
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