This version of French Onion Soup is pure bliss. The classic comfort food provides a decadent display of a warm soup bowl topped with bread slices and sprinkles of freshly grated Parmesan and Mozzerella cheeses.
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.
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