"Croquette" is a general term that describes a sweet or savory mix of ingredients that's shaped into nuggets or cylindrical pieces, then coated in a breadcrumb mixture and fried in oil. Croquettes are served hot, and usually with a sauce. The classic French croquette contains minced meat, plus mushrooms, a type of sauce called Madeira, egg yolks and butter. Other common ingredients include potatoes, cheese and cod, although you can make almost anything into a croquette, including apricots, rice and chestnuts.
To create mashed potato croquettes, stir some finely-chopped meat or fish into the potatoes, or complementary foods like corn, bacon or onion. Add an egg to bind things, then roll into small balls, dip into a beaten egg, roll in bread crumbs and fry. To eat, first dip each corequette into the sauce of your choice: mustard, salsa, sour cream, soy sauce, catsup, etc.