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Cook pasta according to package directions.
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Meanwhile, brown sausage in a skillet and drain.
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In a large bowl, combine milk and soup. Stir in 1/2 cup onions, 1/4 cup of each cheese, and sausage.
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Drain pasta and stir into sausage mixture.
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Transfer to a greased 13 x 9 baking dish. Cover and bake at 375 degrees for 25-30 minutes or until bubbly.
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Sprinkle with remaining onions and cheese and bake, uncovered, 3-5 minutes longer or until cheese is melted.