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From Memory Alpha, the free Star Trek reference

Potato casserole is a casserole made from potatoes and other ingredients.

A favorite of Miles O'Brien, he served it to his wife Keiko O'Brien in an attempt to broaden her culinary horizons, describing it as "a dish fit for kings".

She was unimpressed, particularly with the "little dark things" it contained. (TNG: "The Wounded")