I "created" this recipe when I couldn't find the equally simplistic recipe I had once used before. Though suitable if you have extra onions and want something warm in a hurry, I'd more enthusiastically recommend my crockpot version to be posted soon if you want something truly yummy.
4 medium onions, thinly sliced
1/4 butter (use less if possible)
5 cups beef broth
3 TB flour
Salt and pepper
French bread or bakery bread of choice
Mozzarella cheese, shreded
Preparation: Saute onions in butter, using you judgment as to right about. Mix in flour. Whisk in beef broth. Generously salt and pepper to taste. Bring to a boil, then let simmer for 20 minutes.
Serve: Place toasted slice of french bread on top of 1 cup of soup in an oven safe bowl to be used for serving. Cover with cheese. Broil till cheese has browned slightly.