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Preheat oven to 400 degrees.
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Saute ground beef and onions until beef is cooked through and no longer pink.
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Sprinkle beef with taco seasoning and add 1/2 cup water; mix through.
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Add olives and 1/4 cup of enchilada sauce. Simmer for about 1-2 minutes,
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Add 1/2 cup cheese to the beef and stir until melted.
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Spoon 1 cup of enchilada sauce in the bottom of a 9x13 inch baking dish.
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Fill each shell with 1 tablespoon of beef mixture and lay in the dish. Repeat until all are filled and you have used up all the meat filling.
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Pour remainder of enchilada sauce over shells.
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Sprinkle shells with cheese.
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Cover and bake for 30 minutes.
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Uncover and bake for 5 additional minutes.