Slice the hard boiled eggs in half lengthwise with a sharp knife. Remove the yolks into a separate large bowl. Place the egg whites with the openside facing up on a serving dish. Add to the yolks: mayonnaise, mustard, vinegar, lemon juice, garlic powder, onion powder, salt and pepper. Use an immersion blender until the egg yolk mixture is completely smooth. Use a spoon to fill each of the white halves. Garnish with chopped chives. Serve at room temperature as a finger food, or a meal. Enjoy!