1Place the eggs in a saucepan and cover them with water. Bring to a boil over medium-high heat.
Once boiling, remove the saucepan from heat, cover, and let the eggs sit for 10-12 minutes.
Drain the hot water and transfer the eggs to a bowl of ice water to cool for about 5 minutes.
Peel the eggs and chop them into small pieces.
In a mixing bowl, combine the chopped eggs, mayonnaise, mustard, and chopped celery. Mix well.
Season the egg mixture with salt and pepper to taste.
Lay out the slices of whole grain bread and evenly distribute the egg salad mixture onto four slices.
Top with the remaining slices of bread to form sandwiches.
Cut each sandwich in half and serve.