5 hard boiled eggs
1/2 tsp salt
1/8 tsp pepper
1/4 cup plain yogurt
1/4 cup mayonnaise
optional: 1/8 cup each of celery and onion, finely chopped

Peel eggs – separate white from yellow. Chop the egg white. Add celery and onion, if desired. Whisk the yellow, salt, pepper, yogurt and mayonnaise together. Mix everything together and chill.