Wash the potatoes well. Place them in a large saucepan, cover with water, and add a generous amount of salt (when the water tastes slightly salty is enough). Bring to a boil and cook, covered, until potatoes are soft when pierced with a fork, about 15 minutes. Remove from water and allow to cool until they’re easily handled.
Preheat oven to 400F. Cut the potatoes in half lengthwise. Use a melon baller or measuring spoon to scoop out about 1 teaspoon of flesh from each potato half, leaving a rim with a thickness of about 1/4-inch. Put the removed potato flesh into a large bowl. Place potatoes skin side down on a baking sheet, sprinkle with salt and pepper, and bake for 15-20 minutes.
While the potatoes are baking, make the guacamole. Mash the potatoes until smooth. Add the avocado and lime juice and mash well. Add all remaining ingredients except the red onion and chives.
When the potato skins are just beginning to get crispy, remove them from the oven. Allow them to cool slightly and fill with guacamole. Sprinkle with red onions and chives and serve warm or room temperature.
One serving is 3 potato halves.Each serving is about 2 points on Weight Watchers Freestyle program (depending on the size avocado you use.)