Melt butter in large skillet on medium heat. Add onions; cook 15 min. or until golden brown, stirring frequently. Add beef broth, water and bay leaf; stir. Bring to boil; cover. Simmer on medium-low heat 15 min. Remove and discard bay leaf.
Heat broiler. Ladle soup evenly into 6 ovenproof bowls; top each bowl of soup with 2 toast slices. Sprinkle evenly with cheeses.
Broil 5 to 10 min. or until cheese is golden brown.
For a milder cheese flavor, substitute KRAFT Shredded Mozzarella Cheese for the Swiss cheese.
Calories From Fat
% Daily Value*
Total Fat 12g
Saturated Fat 7g
Trans Fat 0g
Total Carbohydrates 18g
Dietary Fibers 3g
* Percent Daily Values are based on a 2,000 calorie diet.
6 servings, 1 cup each
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.