Buttery, crumbly, sweet Scottish biscuit.

(UK) a light snack consisting of an oblong piece of shortbread with a layer of caramel and then another of hard chocolate on top.

Caramel shortbread, also known as caramel squares, caramel slice, millionaire's shortbread, millionaire's slice, chocolate caramel shortbread or Wellington squares is a biscuit confectionery composed of a shortbread biscuit base topped with caramel and milk chocolate.