Name & recipe - potato and butter dish?

Please bear with me - I am not of Polish descent. The small Catholic Church and school nearby hosts an annual Carnawal in October. The Polish dinner is amazing and I am obsessed with the potato dish they serve. I know it’s “smashed” potatoe chunks practically swimming in butter. I can’t recreate it - I’ve tried. Something is missing, or my technique is off. Does anyone have any idea what this dish is?

Yes, I’ve tried calling the office as well as asking my coworker who is one of the organizers. Their women’s guild/group guards their recipes apparently.