Cook noodles according to package instructions. Drain well.
Meanwhile in large skillet over medium heat brown ground beef. Remove to plate leaving any fat in the pan. Melt 2 tablespoons of butter over medium high heat. Swirl the butter several times to keep from burning. Add mushrooms and cook until almost golden brown: approximately 5 minutes. Add onions and peppers and cook additional 2-3 minutes.
Reduce heat to low. Stir in french onion soup and Worcestershire sauce. In small bowl whisk together cornstarch and 2 tablespoons cold water. Whisk mixture into skillet and cook for 2 minutes or until slightly thickened. Add browned beef and cooked pasta to skillet with vegetables. Add chopped provolone, cover and melt cheese. Salt & pepper to taste.