Directions. Prep. Cook. Ready In. 1  Place egg in a saucepan and cover with cold water. 2  Bring water to a boil and immediately remove from heat. 3  Cover and let eggs stand in hot water for 10 to 12 minutes. 4  Remove from hot water, cool, peel and chop. 5  Place the chopped eggs in a bowl, and stir in the mayonnaise, mustard and green onion.