All it takes is a little meal prep, some big fancy glasses and a whole lot of mashed potatoes!
For the meal prep, use your imagination of what would taste good with mashed potatoes... onions, cheese, gravy, mushrooms, French's fried onions, etc.
The video suggests using margarita glasses to serve. They are extremely useful if you have limited room. Walk, eat and talk! Check for plastic disposable at the local dollar store or party store as opposed to expensive glass wear.
Potatoes are so cheap! Here in the United States, one may usually buy a five (5) pound bag for around $3.00! Would you rather have something easier to make? Instant is very inexpensive too! Mashed potatoes are mashed potatoes!
Simply, designate a table or counter with everything for an easy serving assembly line.