Boil the eggs by placing them in a saucepan, covering with cold water, and bringing to a boil. Reduce heat and simmer for 9-12 minutes.

Cool and peel the eggs by transferring them to an ice bath for 5-10 minutes, then peel.

Mash the peeled eggs in a bowl to your desired texture.

Mix in mayonnaise, mustard, salt, and pepper with the mashed eggs until it’s well-blended.

Assemble the sandwich by spreading the egg salad mixture between two slices of bread, adding lettuce if desired.

Serve and enjoy your sandwich, or pack it for a picnic!