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.