French Onion Soup

We had a very stormy day here today,and this soup seemed like the perfect thing to make.It is very easy,and so rich & delicious.A perfect comfort food.
Ingredients:
4 tbsp. butter
2 c. thinly sliced onions
6 cups of  beef stock
1 tsp. worcestershire sauce
4-6 slices of french bread,toasted
3/4-1 c. gruyere cheese
   Melt the butter in a large saucepan.Add the onions ,and cook over medium heat for about 10 minutes,until the onions are tender.Add the beef broth and the worcestershire sauce.Bring to a boil,then reduce the heat .Cover and cook for another 10 minutes.
  While the soup is simmering,place the bread slices on a sheet pan.Brush lightly with olive oil,and sprinkle with salt & pepper.Bake at 350 until toasted,about 5 minutes.

    Ladle the soup into oven proof bowls.Place a few slices of the toasted bread on top,and sprinkle with cheese.Broil until the cheese turns brown and bubbly.