Twice Baked Potatoes with Tarragon

I made this recipe along with my Roast Beef and Yorkshire Pudding for Christmas dinner. This recipe paired perfectly with the beef and was such a wonderful diversion from a traditional mashed or baked potato. This is also a wonderful side dish that you can make a few hours ahead. You can get the potatoes ready in advance (filling and all), set them aside for a bit, and then put back in the oven right before you are ready to serve. If you are wanting a "different" potato dish to serve, I urge you to try this.

Ingredients
Source: Williams-Sonoma Bride & Groom Cookbook, page 180

4 medium russet potatoes (I used 5)
2 tsp extra virgin olive oil
4 Tbsp unsalted butter
1/2 cup milk
kosher salt and fresh ground pepper
3 Tbsp crème fraiche or sour cream (I used sour cream)
1/3 cup chopped fresh tarragon (I used a bit less then this)

Directions
Preheat oven to 400 degrees. Prick the potatoes with a fork and rub with olive oil and sprinkle with 1 tbsp water. Wrap each potato in aluminum foil and bake for at least 1 hour or until the potatoes are fork tender. Remove the potatoes when ready and unwrap. Leave the oven on.

when the potatoes are cool enough to handle, halve them lengthwise. Scoop out flesh into a saucepan and set the skins aside. Mash the flesh with butter, milk, and salt and pepper to taste. Reheat over low heat and stir in the Crème fraiche or sour cream. Remove from heat and stir in the tarragon.

Fill a pastry bag fitted with a large star tip with the mashed potato mixture. Pipe mashed potato mixture into each potato skin until filled evenly to the top. If you don't want to use a pastry bag, you can also fill the potato skins using a spoon. Place the filled potatoes on a baking sheet and bake until golden on top, about 15 minutes. Serve at once.