In a Dutch oven, heat melt 2 Tablespoons butter over medium-high heat. Brown the sliced beef in batches until seared on all sides. Remove and set aside.
In the same pot, melt the remaining 2 Tablespoons butter and cook the mushrooms, onion and garlic until the mushrooms have released their liquid and the mixture is just softened.
Sprinkle the flour over the vegetables and stir to combine. Cook for 2 minutes. This will eliminate any raw flour taste.
Add the beef broth, Worcestershire sauce, seasoned salt, and black pepper. Stir well, scraping the bottom to release any browned bits.
Return the browned beef to the pot and bring to a simmer over medium heat.
Reduce the heat to low and cook, covered, for45 minutes, or until the beef is tender, stirring occasionally.
While the beef is simmering, cook the egg noodles according to package directions.
Remove the Dutch oven from the heat and stir in sour cream.
Spoon the stroganoff over egg noodles and sprinkle with parsley.