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Brown the onions in olive oil until they start to get tender.
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Add the ground beef to the skillet with the onions and cook until the ground beef is no longer pink. Sprinkle taco seasoning over beef; add the black olives, diced tomatoes, and tomato sauce and mix through.
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Stir in the water and bring to a light boil.
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Add the spaghetti and stir for about 3 minutes, making sure the spaghetti doesn't stick together. Keep cooking for about 2 more minutes, stirring often.
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Cover, reduce heat and simmer for 10-12 minutes or until pasta is tender.
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Sprinkle cheese and green onions on top and cover until cheese is melted.