The best one I have found came on the back of a Sargento Cheese package about 5 years ago. It is titled: Wisconsin Cheddar Cheese Soup. It was one of those recipes that was so good DH said, Lose this recipe, it's too good.
1/4 Cup butter
1/4 cup all purpose flour
2 1/2 cups milk
1 cup beer or water
2 tsps Worchestershire Sauce
1/2 tsp salt
1/2 tsp dry mustard
1/4 tsp cayenne pepper
2 cups Sargento sharp shredded cheddar cheese
Garlic or herbed croutons (optional)
Melt butter in large saucepan over medium heat. Add flour;cook until bubbly, stirring constantly. Add milk;heat to a boil over high heat, stirring constantly. Reduce heat, stir in beer, Worcestershire, salt, mustard and cayenne. Simmer 10 minutes. Stir in cheese; cook, stirring constantly, just until cheese melts (do not boil). Ladle into warm soup bowls; serve with croutons. 4 servings.