Prepare the Eggs:
Chop the hard-boiled eggs into small pieces and place in a medium bowl.
Mix the Dressing:
In a small bowl, combine mayonnaise, mustard, salt, and pepper. Adjust seasoning to taste.
Combine:
Add celery, red onion, and optional herbs to the eggs. Pour in the dressing and gently mix until well combined.
Chill (Optional):
