Onion Soup - cooking recipe

Ingredients

1/4 c. butter or margarine
4 c. thinly sliced onion
4 cans (10 1/2 oz.) condensed beef broth, undiluted
4 to 6 slices French bread, 1 inch thick
1/4 c. grated Gruyere or Swiss cheese
2 Tbsp. grated Parmesan cheese

Preparation

In butter in a large skillet, saute onion until golden but not browned, about 8 minutes.
In medium saucepan, combine beef broth and sauteed onion; bring to boiling.
Reduce heat; simmer, covered, 30 minutes.