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Heat large skillet over medium heat.
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Saute onions and mushrooms with 1 tablespoon butter just until softened. Remove from pan and set aside.
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Add 2 1/2 cups milk (or milk and cream), water and butter into pan. Stir in pasta and dry cheese mix.
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Bring to a boil. Cover and cook according to package instructions.
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Halfway through cooking, stir in shrimp. Cover.
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Two minutes before your pasta is finished, stir in mushrooms and onion. Cover.
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Top with crumbled bacon and parsley (if desired).
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Serve immediately.