Pierce the eggs and cook in boiling water for about 9 minutes. Drain, rinse and remove the shell. Let the eggs cool down
Heat the oil in a small pan, add the ham and leave it crisp. Remove from the pan with the frying fat and let it cool down. Let some ham drip off on kitchen paper. Wash the chives, shake dry and cut into fine rolls. Finely dice the eggs
Mix mayonnaise, milk and yoghurt. Season to taste with salt, pepper and sugar. Mix in eggs, ham with the frying fat and chives (except for something to garnish). Arrange in cups sprinkled with remaining chives and ham