Boil the Eggs: Start by hard-boiling your eggs. Place them in a pot and cover with cold water. Bring to a boil, then reduce to a simmer and cook for about 10-12 minutes. Once done, cool them under cold water and peel.
Mix the Salad: In a mixing bowl, roughly chop the hard-boiled eggs. Add in the mayonnaise, Dijon mustard, salt, pepper, and chopped chives or green onions.
Combine: Gently mix the ingredients together, being careful not to mash the eggs too much—you want those delicious chunks to shine!
Assemble the Sandwich: Spread the egg salad mixture onto one slice of bread. Top with the second slice, press down gently, and slice in half.
Serve: Enjoy immediately, or refrigerate for an hour to let the flavors meld!