Slice the onions ?" thick. Melt butter in a large pot and sauté the onions over low heat for 1½ - 2 hours. Add seasonings; pepper, paprika and bay leaves. Mix well and saute on low for 2-3 minutes; stirring frequently. Add ? of the broth to the pot and stir well. And the flour to the remaining broth and mix thoroughly and then add to the pot, stirring in. Add wine and simmer 2 hours. Refrigerate overnight. Turn on oven to broil. Brush bread slices with olive oil and sprinkle with Parmesan cheese. Lightly brown bread using the broiler watching very carefully so not to burn. Heat soup on stove top. Layer soup, then Parmesan toasted bread, then cheese in ovenproof bowls. Broil until cheese melts; 3-5 minutes. Watch carefully! Let cool for a couple of minutes before eating.