In a skillet, brown beef until no loger pink and drain off any excess grease.

Mix in French onion soup, gravy, and mushrooms. Bring mixture to a boil.

Reduce heat to simmer. Cover and simmer for 5 minutes

In a small bowl mix together the cornstarch and water until smooth.

Slowly add to the beef mixture while stirring.

Bring mixture back up to a boil and cook for about 2 minutes until thickened. Serve over cooked noodles and garnish with green onion. Serves 4.