What was Napoleon's favourite dessert?

A classic French dessert, Mille Feuille goes by different personas in different countries. North Americans call it Napoléon, people in the United Kingdom call it vanilla slice, and it is also a custard slice in general. Although the terms Napoléon and Mille Feuille are used interchangeably, they are slightly different. The former uses almond pastry cream, and the latter uses just regular pastry cream. The claims of its connection to the French emperor are dubious. Some food historians believe the name Napoleon may instead relate to similarities with Italian desserts from the city of Naples.