Fill a saucepan with cold water and gently place the eggs inside. Bring the water to the boil over a high heat and once boiling set the egg timer for 8 minutes, for hard boiled. Drain and peel.
Slice the hard boiled eggs in half and transfer the yolks to a bowl. To the yolks add the mayonnaise, chives, parsley, mustard and cornichons; mix well. Using two teaspoons carefully spoon the mixture back into the egg and place on a serving plate. Season to taste and serve immediately.