01 - Heat a large skillet over medium-high heat. Add beef strips and cook until browned on all sides. Remove and set aside.
02 - In the same skillet, add onions and sauté until translucent. Add garlic and mushrooms, continuing to cook until mushrooms are softened.
03 - Sprinkle flour over the vegetables, stirring constantly for 1 minute to create a roux.
04 - Pour in beef broth, stirring well to combine. Simmer over medium heat until the sauce thickens, about 4-5 minutes.
05 - Reduce heat to low. Stir in sour cream and return beef strips to the skillet. Cook gently until warmed through. Season with salt and pepper.
06 - Spoon the stroganoff over cooked egg noodles and serve immediately.