2 cups thinly sliced onions
1/2 cup butter or margarine
1/4 cup all-purpose flour
2 cups chicken broth
2 cups milk
1-1/2 to 2 cups (6 to 8 ounces) shredded mozzarella cheese
Salt and pepper to taste
Croutons, optional
In a large kettle, sauté onions in butter over low heat until tender and transparent, about 20-30 minutes. Blend in flour. Gradually add broth and milk; cook and stir over medium heat until bubbly. Cook and stir for 1 minute more; reduce heat to low. Add mozzarella cheese and stir constantly until melted (do not boil). Season to taste with salt and pepper. Serve with croutons if desired.