Put oven rack in middle position and preheat oven to 350°F. Butter a large baking sheet.
Whisk together cornstarch 3/4 cup flour baking powder and salt in a small bowl.
Beat together butter and sugar in a large bowl with an electric mixer until light and fluffy then beat in egg yolks Pisco and vanilla. Stir in flour mixture until combined adding 1 to 2 tablespoons flour if dough is sticky. (Dough should be soft.)
Form dough into a disk and roll out into an 11-inch round (1/8 inch thick) on a lightly floured surface with a lightly floured rolling pin. Cut out 32 rounds with cutter (reroll scraps if necessary) and transfer to sheet arranging rounds 1/2 inch apart.
Bake until firm and pale golden around edges 12 to 15 minutes. Transfer to a rack and cool 10 minutes.
Sandwich cookies with about 1/2 teaspoon dulce de leche. Dust with confectioners sugar.
Cookies can be made, but not filled, 3 days ahead and cooled completely, then kept in an airtight container at room temperature.
This recipe has been added to the following public cookbooks:
The Adams Family's Holiday Cookie Cookbook,
2008 AOL Holidays Cookie Calendar Recipes
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Here's an easy, reliable way to ensure a moist and flavorful turkey...simply baste the turkey with chicken stock during roasting. When the turkey is done, use a bit more stock to make a quick and tasty gravy.
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