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Twice-Baked Potatoes
The potatoes can be cooked and filled up to 2 hours in advance.

Ingredients

12 small Yukon gold potatoes [about 3 lbs.]
6 large egg yolks   
4 tablespoons unsalted butter, softened   
1/2 cup heavy cream    
1 1/2 cups grated Gruyere cheese
1 tablespoon  + 2 teaspoons coarse salt
freshly ground pepper

Method
Preheat oven to 425°
Wrap potatoes in aluminum foil, and bake until softened, about 1 hour. Let cool.

When potatoes are cool enough to handle cut each in half. Scoop out the flesh, reserving the skins, and pass through a ricer, or mash by hand. Stir in egg yolks, butter, cream, 1 cup Gruyere, salt and pepper. Pipe or scoop filling onto reserved skins. Cover with foil and refrigerate until shortly before serving.

Heat oven to 400°
Place filled potatoes on a baking sheet, and sprinkle with remaining Gruyere.
Bake until filling is set and tops are golden brown, about 25 minutes.

Serve immediately.