Hearty Onion Soup - cooking recipe

Ingredients

6 Spanish onions, sliced
1 Tbsp. olive oil
1 Tbsp. butter
3 Tbsp. all-purpose flour
3 cans (14 3/4 oz.) reduced-sodium beef broth
1/4 cup dry sherry (optional)
6 thick slices Italian bread
6 slices reduced-sodium Swiss cheese

Preparation

Cook onion in oil and butter in pot over medium heat, stirring frequently, 30 minutes until softened and caramelized. Stir in flour to coat onions.
Cook 1 minute.
Slowly stir in broth.
Cover; cook over low heat 20 minutes.
Add sherry if you wish.