Cook the Noodles:Bring a pot of salted water to a boil. Cook the egg noodles for 2 minutes less than package directions suggest. Do not rinse. Set aside.
Brown the Beef:In a large skillet over medium heat, cook ground beef until fully browned with no pink remaining. Drain excess grease and set the beef aside.
Make a Roux:In the same skillet, melt butter over medium heat. Whisk in the flour and cook, stirring constantly, for about 2 minutes to form a roux.
Add the Liquids:Slowly pour in the beef broth while whisking to avoid lumps. Once the sauce begins to thicken, add the milk and continue whisking until the mixture is smooth and creamy.
Season the Sauce:Stir in garlic powder, onion powder, salt, and black pepper until well combined.
Combine Everything:Reduce heat to low. Add the cooked noodles and browned beef back into the skillet. Stir gently to coat everything in the creamy sauce.
Finish with Sour Cream:Remove the skillet from heat and stir in the sour cream until fully incorporated.
Serve & Enjoy:Serve warm with steamed vegetables or garlic toast for a complete meal.