Slow Cooker French Onion Soup

This slow cooker recipe for French Onion soup I got from the Betty Crocker site.  After reading some of the comments I took the advise and browned the onions in butter on low over night first.  It's pretty good.  Next time I'm going to try one of the other suggestions to substitute some of the beef broth with a 1/2 cup of red wine and skip the sugar because it was a little sweet.

Here is the recipe as I used it.
Ingredients

3

large onions, sliced (3 cups)

3

tablespoons butter

3

tablespoons all-purpose flour

1

tablespoon Worcestershire sauce

1

teaspoon sugar

1/4

teaspoon pepper

4

cans beef broth

Mix onion and butter and cook on low for 3 hours until onion starts to brown.  Then mix the rest of the ingredients into the slow cooker and cook on low for 7 - 9 hours.

Broil mozarrella cheese on pices of french bread and serve on top of the broth.