Duchess Potatoes

Step 1
Prepare a piping bag with a large open star tip.

Step 2
Preheat the oven to 400 degrees F (200 degrees C). Grease a baking sheet.

Step 3
Fill a 3-quart pot with 4 inches water and 1 teaspoon salt. Add potatoes; bring to a boil. Reduce heat to low; simmer until tender, 20 to 25 minutes. Drain; return potatoes to the pot.

Step 4
Cook potatoes over low heat until remaining water steams off, about 3 minutes. Let cool at least 15 minutes.

Step 5
Place potatoes in a food processor and process until smooth. Let stand for 5 minutes. Add butter, egg yolks, remaining 1 teaspoon salt, nutmeg, and pepper. Mix until just combined; spoon into the piping bag.

Step 6
Pipe potato mixture onto the prepared baking sheet into eighteen 2-inch rosettes with a circular motion, finishing with a small peak in the center. Refrigerate until slightly firmer, about 25 minutes.

Step 7
Mix egg and heavy cream together in a bowl; brush mixture onto rosettes.

Step 8
Bake in the preheated oven until golden brown, 35 to 40 minutes.