Saute Onions In Butter For 30 Minute On Low Heat Until Golden Brown And Carmelized. Add Broth And Bring To A Boil, Reduce Heat And Simmer For 1 Hour. Combine Cream And Egg. Stir Into The Soup And Simmer For 5 Minutes. Do Not Allow It To Boil. Cook Pasta As Directed. Serve Soup Over Cooked Pasta. Sprinkle With Cheese.