Cover pan and let sit for 10 minutes. Meanwhile, chop up your celery and green onion.
When the timer goes off, run your eggs under cold water, dry off and peel. Mash the eggs in a small bowl, add celery and green onion. Add a shake of salt and pepper, and a spoonful of sour cream. (Start small with the sour cream - you want just enough to hold the mixture together, but not so much that it becomes drippy. Yuck!)