Slow Cooker French Onion Soup

Slow Cooker French Onion Soup was pinched from <a href="http://www.myrecipes.com/recipe/slow-cooker-french-onion-soup" target="_blank">www.myrecipes.com.</a>

"The slow cooker completely eliminates the stirring part of caramelizing onions; it all goes happily unattended. Freeze the bag of soup in a bowl rather than laying it flat, so it will fit in the saucepan when it's time to thaw...."

INGREDIENTS
1/4 cup unsalted butter
6 thyme sprigs
1 bay leaf
5 pounds large sweet onions, vertically sliced (about 16 cups)
1 tablespoon sugar
6 cups unsalted beef stock (such as Swanson)
2 tablespoons red wine vinegar
1 1/2 teaspoons kosher salt
1 teaspoon black pepper
24 (1/2-ounce) slices whole-grain French bread baguette
5 ounces Gruyère cheese, shredded (about 1 1/4 cups)
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