Heat olive oil in a large pan over medium-high heat. Add the beef strips and cook until browned, about 2-3 minutes per side. Transfer to a plate and keep warm.
In the same pan, melt the butter and add the chopped onion and mushrooms. Sauté for 6-8 minutes until softened.
Add minced garlic and cook for an additional minute until fragrant.
Sprinkle the flour over the mixture and stir for about a minute.
Pour in the beef broth and add the heavy cream. Simmer for 1-2 minutes until slightly thickened.
Temper the sour cream by mixing it with a bit of the hot sauce, then stir it back into the pan along with Worcestershire sauce, Dijon mustard, salt, and pepper.
Return the beef to the pan and let it simmer gently until heated through.
Serve over cooked egg noodles or rice, garnished with chopped green onions or parsley.
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Notes
Pair with a side salad or crusty bread for a complete meal.