Ingredients
3/4
stick (6 tbsp) unsalted butter, softened 1/3 cup cornstarch 3/4 to 1 cup all-purpose flour 1/4 tsp baking powder 1/8 tsp salt 1/4 cup granulated sugar 2 large egg yolks 1 tbsp Pisco or regular brandy 1/4 tsp vanilla About 1/4 cup dulce de leche* Confectioners sugar for dusting
Special equipment: a 1 1/2-inch round cookie cutter
Directions
1.
Put oven rack in middle position and preheat oven to 350°F. Butter a large baking sheet.
2.
Whisk together cornstarch, 3/4 cup flour, baking powder, and salt in a small bowl.
3.
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.)
4.
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.
5.
Bake until firm and pale golden around edges, 12 to 15 minutes. Transfer to a rack and cool 10 minutes.
6.
Sandwich cookies with about 1/2 teaspoon dulce de leche. Dust with confectioners sugar.
8.
Cookies can be made, but not filled, 3 days ahead and cooled completely, then kept in an airtight container at room temperature.
9.
*Available at Latin markets and many supermarkets.