Your task is to bring back the French Monarchy. But the Monarch must be a Bonaparte and have the title Emperor of France. The POD is anytime after Vichy France was created (so anytime after 10 July 1940.)
How you do it is up to you but it has to be legitimate (i.e. No ASB.) And it must also not have any disaster, use of Nuclear Weapons and no Soviet invasion etc.
Go!