Place eggs in a medium saucepan and cover with cold water; bring to a boil, then remove from heat. Let the eggs stand in hot water for 10 minutes. Drain and cool under cold running water.
Peel the eggs and chop them into a bowl using an egg slicer. Add celery, mayonnaise, onion, mustard powder, and salt; stir to combine.
Serve immediately or chill in the refrigerator until ready to eat.
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