Slice the beef into thin strips, then season generously with salt and pepper.
In a large skillet, melt the butter over high heat. Sear the beef until browned on all sides. Remove from the skillet and set aside.
In the same skillet, sauté the finely chopped onion and garlic until translucent and fragrant.
Add the sliced mushrooms and continue to sauté until they soften and release their moisture.
Sprinkle the flour over the mushroom mixture and stir to combine. Gradually pour in the beef broth, stirring constantly to prevent lumps. Simmer for 5-6 minutes, or until the sauce has thickened slightly.
Stir in the sour cream until well combined, then return the beef to the skillet. Reduce heat to low and simmer for 10 minutes, allowing the flavors to meld.
Meanwhile, cook the rice noodles according to package directions, then drain well.
Serve the beef stroganoff over the rice noodles, garnished with fresh parsley.
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