Chocolate shortbread biscuits, with Bordier butter

A real little everyday pleasure, in this crunchy biscuit, you will recognize Bordier Demi-Sel Butter!
 So will you start with the edges, the corners, or devour it in one bite?
 List of ingredients: Wheat flour (GLUTEN), Dark chocolate (Cocoa paste, sugar, cocoa butter, emulsifier: soy lecithin, natural vanilla flavoring), Bordier Demi-Sel Churned Butter (Milk), Sugar, Whole fresh egg, Egg yolk, Guérande salt, Raising agent (disodium diphosphate, sodium bicarbonate, wheat starch)
 Storage advice: Store in a dry place, at room temperature and away from light.