4 yellow onions, thinly sliced
4 tbsp. butter
1 qt. beef stock
1-1/2 c. croutons (buttered, toasted, and cubed French bread)
2 c. grated Swiss cheese
1/2 c. grated Parmesan cheese

Melt butter in skillet. Sauté onions until slightly brown. Add onions to beef broth in saucepan. Simmer slowly for 10 minutes. Pour into bowls. Place croutons on top of each bowlful, and either sprinkle Parmesan cheese on top and serve immediately, or cover croutons with Swiss cheese, then Parmesan and bake, covered, at 325°F for 15 minutes. Uncover and bake another 10 minutes.