Bring a large pot of salted water to a boil. Cook the egg noodles according to package instructions until al dente. Drain and set aside.
While the noodles cook, heat a large skillet over medium-high heat. Add the butter and olive oil until the butter melts. Add the sliced sirloin steak and cook for 2-3 minutes per side until browned. Transfer the steak to a plate and set aside.
In the same skillet, add the chopped onion and sliced mushrooms. Cook for 5-6 minutes until softened and the mushrooms release their moisture. Stir in the minced garlic, smoked paprika, dried thyme, salt, and black pepper. Cook for 1 minute until fragrant.
Pour in the beef broth and Worcestershire sauce, scraping up any browned bits from the bottom of the skillet. Simmer for 3-4 minutes until the liquid reduces slightly.
Reduce the heat to low and stir in the sour cream until fully combined and the sauce is creamy. Return the cooked steak to the skillet and heat for 2-3 minutes until warmed through.
Serve the beef stroganoff over the cooked egg noodles. Garnish with chopped parsley and enjoy immediately.