Mashed potatoes
Mashed potato or mashed potatoes , colloquially known as mash (British English), is a dish made by mashing boiled or steamed potatoes, usually with added milk, butter, salt, and pepper. It is generally served as a side dish to meat or vegetables. Roughly mashed potatoes are sometimes called smashed potatoes.[citation needed] Dehydrated instant mashed potatoes and frozen mashed potatoes are available. Mashed potatoes are an ingredient in other dishes, such as dumplings and gnocchi. The Andean people of South America domesticated as many as 70 different species of potatoes which were commonly prepared by boiling and mashing prior to the European arrival.
Source: Wikipedia
Recipes

Betty's Best Mashed Potatoes Recipe - BettyCrocker.com
If you’ve ever spent lots of time and effort only to turn out lumpy, tough spuds, this mashed potatoes recipe is for you. These potatoes turn out thick, creamy and ever-so smooth. The secret isn’t to use expensive ingredients or tricky methods, although...

The Best Mashed Potatoes Recipe (video) - Recipes by Carina
The BEST Mashed Potato recipe! Smooth, fluffy, creamy and full of flavour, this side dish deserves a spot at your dinner table! Homemade Mashed Potatoes These mashed potatoes are honestly the best you'll ever eat. Creamy, fluffy, buttery and smooth! All...