Hard boil the eggs. To do this bring water to a boil with eggs already in it. Once the water starts to boil, set the timer for 15 minutes. Transfer to cold water after to cool.
Peel shells off the eggs.
Using an egg slicer, slice the eggs into a bowl.
Add in mayonnaise, dijon mustard, carrots, celery, parsley, green onions and salt. Mix well.
Serve on crackers or sandwiched between two pieces of bread.