buttercream sandwich cookie
A sweet consisting of buttercream or butter-based filling between two cookies or biscuits. Common in Hokkaido souvenir confectionery.
I bought buttercream sandwich cookies as a souvenir from Hokkaido.
These buttercream sandwich cookies have a perfect balance of crispy cookies and rich buttercream.
Variant with interpunct; less common but seen in product names or menus.
Wasei-eigo (Japanese-made English) from 'butter' + 'sand', short for 'sandwich'. Refers to a buttercream-filled cookie sandwich, not a butter sandwich in the Western sense.