Best Italian Onion Soup

I made this onion soup recipe one cold winter night
when there was about a foot of fresh snow on the ground,
It was a warm and comforting soup to get me
through the that cold winter night snowstorm.

Ingredients:
1/2 pound Firm white onions, peeled and sliced
1/4 cup Unsalted Butter
2 tablespoons Olive oil
3 tablespoons all purpose Flour
1 quart lite Chicken broth
1 quart lite Beef broth
8 slices Italian bread
Swiss or greyere cheese,shredded
Parmesan cheese, grated

Directions:
In a pot,saute onions in butter and oil
until onions are transparent, and well browned.
When tender, turn heat to low and add flour, stirring.
Pour in broths. Heat to boiling
Turn off heat, cover and let sit for thirty minutes.
Place onion soup in serving bowls
Mix equal parts of cheese to smooth paste and spread over bread.
Float a slice of bread atop each serving bowl of soup.
Place all bowls on a baking sheet, in oven 4" from broiler,
broil until cheese melts. Serve at once.
Leftover soup freezes well up to 6 months.