In a large skillet, melt butter over low medium heat. Add sliced onions to skillet. Saute until tender. Mix in salt, pepper, 1 tbls. olive oil (note: other tbls. of olive oil to be added later) and sugar. Increase heat to medium. Cook onions until they are golden brown. Transfer onions to a large pot and add chicken, beef broth, and remaining ingredients. Bring to boil, reduce heat and simmer covered for 20-30 minutes. If desired, add salt & pepper to taste.