In 2 quart saucepan over medium heat, sauté onions and celery in butter 'til softened. Stir flour into pan. Cook and stir 1-2 minutes over low heat, do not brown. Slowly whisk in milk and broth. Stir in rest of ingredients and simmer over low heat 'til cheeses are melted. Serve topped with crumbled blue cheese, and a celery stick inserted in bowl. (Can also serve with extra hot sauce and a little sour cream if preferred.) Enjoy!