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funeral potatoes

n. (context US English) A casserole of hash browns or cubed potatoes, cheese, and onions, in a creamy soup or sauce.

Wikipedia
Funeral potatoes

Funeral potatoes (also known as Mormon funeral potatoes) are a traditional potato hotdish, or casserole, that may have originated in the Intermountain West region of the United States. Mormon people call this dish funeral potatoes because the casserole is commonly served as a side dish during traditional after- funeral dinners, such as those planned by members of the Relief Society (a LDS auxiliary organization). Funeral potatoes are also served at other social gatherings, such as potlucks, typically in areas with a significant Latter-day Saint population in the Mormon Corridor.

The Los Angeles restaurant Hamburger Hamlet, opened in 1950 by actor Harry Lewis and his wife, serves a somewhat similar dish called "Those Potatoes." It excludes the cream soup, crushed topping, and cheese commonly found in funeral potatoes, containing only hash browns, sour cream, and green onions.