Trim fat from steak; cut steak into thin slices. Coat a nonstick skillet with cooking spray; place over medium-high heat until hot. Add steak; sauté 5 minutes. Add onion and mushrooms; sauté 5 minutes. Reduce heat to medium-low. Add wine, salt, and pepper; cook 2 minutes.
Combine soup and sour cream; stir into steak mixture. Cook until thoroughly heated. To serve, spoon meat mixture evenly over noodles.
Tip: Cook the noodles while you're cooking the meat mixture so that everything is ready at the same time.