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Cook pasta according to package directions. Keep warm. |
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Meanwhile, trim fat from beef and cut into 1/2-inch cubes. |
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Spray large nonstick skillet with vegetable cooking spray. Heat skillet over medium-high heat until hot. Add half of the beef and stir-fry 1-2 minutes or until outside surface is no longer pink. Season with salt and pepper if desired. Remove from skillet and keep warm. Repeat with remaining beef. |
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In same skillet, cook mushrooms and onion in oil 2 minutes or until tender. |
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Stir in flour. Gradually add broth, stirring until blended. Bring to a boil. Cook and stir 2 minutes. |
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Return beef to skillet and heat through. |
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Serve beef mixture over pasta. Sprinkle with green onion and serve with sour cream to dollop on top. |