method
1. Slice onions very thin, add to melted butter and cook slowly until tender but not brown.
2. Add flour and blend well; then add hot chicken stock slowly, stirring constantly. Season.
3. Toast bread, spread with melted butter, sprinkle with Parmesan cheese and heat under broiler until cheese is slightly melted.
4. Place slice on each serving of soup. Serve extra cheese in separate bowl.
