Recently Cook's Illustrated Magazine ran their 2nd article on French Onion Soup in the last 3 years. The new recipe requires around five hours start to finish. While most of that is passive time, waiting for the onions to cook down, that's still vastly too long (in my opinion) for something which is supposed to be a first course.
Fortunately for you, loyal reader, I several years ago created a recipe for a French Onion Soup which is not only possible to prepare in under two hours of mostly passive time, it's also vegetarian! The one caveat is that you really need to have the right ingredients; substitutions don't work on this one.