Instructions
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Step1
Cut beef across grain into about 1 1/2 x 1/2-inch strips.
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Step2Cook mushrooms, onions and garlic in butter in 10-inch skillet over medium heat, stirring occasionally, until onions are tender; remove from skillet.
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Step3Cook beef in same skillet until brown. Stir in 1 cup of the broth, the salt and Worcestershire sauce. Heat to boiling; reduce heat. Cover and simmer 15 minutes.
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Step4
Meanwhile, cook and drain the noodles as directed on package; cover to keep warm.
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Step5
While the noodles are cooking, in a small bowl, whisk the remaining ½ cup broth into flour, making sure to remove any lumps. Stir the slurry into the skillet with the beef mixture.
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Step6
Add the onion mixture and bring to a boil, stirring constantly. Boil and stir for 1 minute.
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Step7
Reduce heat to low and stir in sour cream. Cook for 1 or 2 minutes until hot, without letting the mixture come to a boil, or the sauce may curdle.
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Step8
Serve the beef and sauce over the hot, cooked noodles. Sprinkle with fresh thyme leaves.