Preheat oven to 350 degrees F (175 degrees C).
In a 9×13-inch baking dish, combine the macaroni, tuna, and soup. Mix well, and then top with cheese.
Bake at 350 degrees F (175 degrees C) for about 25 minutes, or until bubbly. Sprinkle with fried onions, and bake for another 5 minutes. Serve hot.
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