Slice onion 1/8" thick. Melt ... in a large soup pot. Add all other ingredients ... bread. Top with Swiss cheese. Place under broiler until brown, approximately 5 minutes.
In a medium saucepan, over ... 5 minutes. Divide soup between 2 ovenproof bowls. Top ... 2 tablespoons grated Swiss cheese. Bake at 325°F for 5 minutes or until cheese melts.
Slice onions thin, set aside. Shred Swiss cheese, set aside. Melt butter ... 45 minutes. Ladle soup into individual serving bowls. Place ... or until cheese melts.