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Submitted by: Robin Hill from Rochester, NY
Originally shared on the web 08/06/2012

1/4 c. butter
3 c. onion, sliced
1 T. sugar
1 t. salt
2 T. all-purpose flour
4 c. low-sodium beef broth
1/4 c. dry white wine or beef broth
6 slices French bread
1/2 c. grated Parmesan cheese
1/2 c. shredded mozzarella cheese

Melt butter in a skillet over medium heat. Add onion; cook for 15 to 20 minutes, or until soft. Stir in sugar and salt; continue to cook and stir until golden. Add flour; mix well. Combine onion mixture, broth and wine or broth in a 4-quart slow cooker. Cover and cook on high setting for 3 to 4 hours. Ladle soup into oven-proof bowls. Top with bread slices; sprinkle with cheeses. Broil until cheese is bubbly and melted. Serves 6.