Steps

• Season the thinly sliced beef sirloin with salt and black pepper to taste.
• Heat olive oil in a large skillet over medium-high heat and brown the beef in batches, removing the beef when browned.
• In the same skillet, add chopped onions and minced garlic. Sauté until onions are translucent.
• Add sliced mushrooms and cook until they release moisture and begin to brown.
• Sprinkle flour over the mixture, stir to coat, then gradually add beef broth while stirring to prevent lumps.
• Add Worcestershire sauce and Dijon mustard, simmer for a few minutes.
• Return browned beef to the pan, simmer until beef is cooked to your liking.
• Remove skillet from heat and stir in sour cream until fully combined.
• Serve the stroganoff over cooked egg noodles or rice, garnish with chopped parsley.