Slice onion 1/4” thick. Cook onions stirring occasionally over low heat,
In melted butter,, with brown sugar if using it, until golden brown, about
Add wine, beef broth, bay leaf, thyme, black pepper, Worcestershire sauce,
Bringing to a boil, simmer about 1 hr. Remove bay leaves and thyme.
Meanwhile, slice bread, brush with olive oil, broil 2 minutes per side or until golden brown
Put toasted bread on bottom of bowls. Ladle into soup bowls, add 2 slices of bread
on top of soup, divide cheeses over bowls, broil until golden brown & bubbly
Cook time 1 hr 20 minutes, total time 1 hr 35 minutes