| 1 | Preheat oven to 350 degrees. |
| 2 | Chop onions to chewable size. |
| 3 | Cut 4 slices of bread into small crouton size then bake until golden. |
| 4 | Set aside. |
| 5 | Saute onions in butter on low heat until soft and dark brown. |
| 6 | Salt and pepper to taste. |
| 7 | In a saucepan, heat both cans of beef broth plus 1 can of water and cook to slight boil. |
| 8 | Add italian bread crumbs and onions. |
| 9 | Pour broth with onions into soup bowls. |
| 10 | Add parmesan cheese and croutons to each bowl, then layer each bowl with a slice of mozzarella cheese. |
| 11 | Place into oven. |
| 12 | Bake until cheese is crisp and brown. |
| 13 | Let sit for a few minutes before serving. |