"Duchess potatoes look fancy, but they are surprisingly easy to make. Just stir egg yolks, butter, cream, plenty of salt and pepper, and a dash of nutmeg into mashed potatoes, then pile the mixture into a pastry bag and pipe it onto a baking sheet in any shape you like. Sprinkle with a little shredded cheese, bake, and you’ll have an elegant potato side dish for your Thanksgiving meal, Christmas table, or even a weeknight dinner party. Special equipment: You’ll need a large piping bag and a 1/2-inch star piping tip for this recipe...."