Step 1

In a Dutch oven or large, heavy pot over medium-high heat, add the oil and 2 tablespoons of the butter. Heat until the butter is melted and the oil is hot. Add the meat in batches and brown on both sides, about 3 minutes per side; set aside. Add the mushrooms, garlic and onion to the pot. Cook, stirring frequently, until the onions are translucent and slightly tender, 5 to 8 minutes. Add the meat back along with the beef stock, soy sauce, mustard and bay leaf. Bring to a simmer, using a wooden spoon to scrape up all the brown bits from the bottom of the pot, and simmer, covered, until tender, about 2 hours and 50 minutes. Add the thyme and cook for an additional 10 minutes.

Step 2

Meanwhile, bring a large pot of water to a boil. Cook the egg noodles in the boiling water according to the package instructions. Drain the noodles and transfer to a bowl. Add the remaining 2 tablespoons butter to the noodles, stirring to melt the butter and distribute it.

Step 3

Add the sour cream and cream cheese to the stroganoff and stir to incorporate. Season with salt and pepper if needed.

Step 4

In a serving dish, place the egg noodles in an even layer and top with the stroganoff. Garnish with the chopped parsley.