In a medium pot, cover potatoes with about 1 inch of water, add 1 teaspoon of salt, and bring to a boil. Reduce heat to medium high and cook potatoes for about 10 minutes. Remove from heat and drain water.
When the potatoes are cool enough to handle but still warm, use a small paring knife to trim and discard about ¼ inch from the top of each potato. Then trim a tiny amount from the bottoms so potatoes stand upright.
Using that same small paring knife, carefully scoop out some of the insides of the cooked potatoes, leaving ¼-inch borders around the edges. Transfer hollowed potatoes to parchment paper-lined baking sheets.
Place the scooped insides and the peeled tops of the potatoes in a medium bowland mash using a potato masher or the back of a fork.
Stir in butter, cream cheese, Mexican Crema, and 3 Tablespoons of the chives until well combined (save the other 2 tablespoon of chives to garnish at the end). Season to taste with salt and pepper.
Carefully spoon the filling back into the hollowed-out potatoes until slightly overfilled and mounded on top.
Bake for about 15 minutes until the filling is heated through and the topping is golden brown. You can turn the broil setting on for up to 2 minutes at this point to get them nice and crispy on the top, but watch them very carefully so they don't burn!
Let them cool for a few minutes; dollop with a little Mexican Crema, then top each potato with ¼ teaspoon of caviar and a sprinkle of chives. Serve warm.