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Season the beef cubes with salt and pepper
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Heat 3 TB of oil in a skillet over high heat
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Brown the meat on all sides, you can do this in batches for even browning
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Remove the beef from the skillet and set aside
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Lower heat to medium, add the onions to the skillet and cook until soft
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Add beef cubes and beef broth to the skillet with the onions
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Cook, with lid slightly tilted, over low heat for about 2 hours
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Heat remaining 2 TB oil and 2 TB butter in another skillet over medium heat
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Add mushrooms, most of the garlic and the thyme to the skillet and cook until mushrooms are tender
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Remove meat from the heat and fold in the mushroom mixture, sour cream, mustard and parsley
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Season with salt and pepper to taste
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Heat the remaining 2 TB butter in another skillet over medium high heat and add the last of the garlic, cooking until fragrant
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Add the "zoodles" and cook just until tender (I like a little bite in mine)
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Serve the beef stroganoff over the zoodles and garnish with parsley and sour cream