Ingredients
Units Scale
- 1/4 cup butter
- 3 cups onion, sliced
- 1 tablespoon sugar
- 1 teaspoon salt
- 2 tablespoons flour
- 4 cups beef broth
- 1/4 cup dry white wine or beef broth
- 6 slices French bread
- 6 slices mozzarella cheese
Instructions
- Melt butter in a skillet over medium heat.
Add onion and cook for 15-20 minutes until soft.
Stir in sugar and salt and stir until golden.
Add flour, mix well.
Combine onion mixture, broth, and wine or broth in a slow cooker.
Cover and cook on low for 6-7 hours.
- When ready to serve, top bread slices with cheese and place under broiler until cheese is bubbly.
- Ladle soup into bowls and top with cheese bread.