Boil the potatoes in salted water until done, preferably with a small core in the middle. Let cool slightly. Or use leftovercold potatoes. Set the oven to 225degrees, hot air.
Put the potatoes in a large oven dish and press downto flatten the potatoes with a fork/bottom of a glas or your palm so that theybecome half flat .
Arrange the smashed potatoes on an oven tray. Brushthe potatoes with oil or butter and add salt and pepper.
Arrange the smashed potatoes on large serving platters. Top each smashed potato with a dollop of sour cream and 1 teaspoon of caviar. Garnish with the chives and serve at once.