4 lg. yellow onions
2 tbsp. butter
1 tbsp. flour
6 c. simmering beef broth
Salt & pepper to taste
6 slices French bread
3/4 c. Swiss or Gruyere cheese, grated
1/4 c. Parmesan cheese

Peel onions and slice them thinly. Separate slices into rings. Saute onion rings in hot butter in a skillet until softened and lightly stir in flour. Add onions to hot broth. Cover saucepan and simmer for 20 minutes. Taste soup and add salt and pepper if necessary. Ladle soup into individual oven-proof soup dishes. Place a round of bread in soup dishes. Sprinkle bread with combined cheeses. Place bowls on a cookie sheet and brown under preheated broiler for 3 minutes until cheese bubbles. Serves 6.