Makes16 sandwich cookies
                    
                
                
                    
                        
                            - Active Time:25 min 
 
                        
                            - Start to Finish:50 min
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              May 2005
            
          
          
      
  
                
                
            
            
            
                In some Latin American countries, these cookies, called alfajores, are made with Pisco brandy distilled from white Muscat grapes grown in Peru, Chile, and Bolivia—but regular brandy works fine.
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            3/4 
                                            
                                            stick (6 tablespoons) unsalted butter, softenened
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            cornstarch
                                            
                                        
 
                                    
                                        - 
                                            3/4 to 1 
                                            cup
                                            all-purpose flour 
                                            
                                        
 
                                    
                                        - 
                                            1/4 
                                            teaspoon
                                            baking powder 
                                            
                                        
 
                                    
                                        - 
                                            1/8
                                            teaspoon
                                            salt 
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            cup
                                             granulated sugar 
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            large egg yolks 
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            Pisco or regular brandy 
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            teaspoon
                                            vanilla 
                                            
                                        
 
                                    
                                        - 
                                            About 1/4
                                            cup
                                            dulce de leche
                                            
                                        
 
                                    
                                        - 
                                            
                                            
                                            Confectioners sugar for dusting
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
                
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Put oven rack in middle position and preheat oven to 350ºF. Butter a large baking sheet.
                                         
                                    
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Whisk together cornstarch, 3/4 cup flour, baking powder, and salt in a small bowl.
                                         
                                    
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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.)
                                         
                                    
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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.
                                         
                                    
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Bake until firm and pale golden around edges, 12 to 15 minutes. Transfer to a rack and cool 10 minutes.
                                         
                                    
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Sandwich cookies with about 1/2 teaspoon dulce de leche. Dust with confectioners sugar.
                                         
                                    
                                
                             
                        
                    
                    Cooks' note: Cookies can be made, but not filled, 3 days ahead and cooled completely, then kept in an airtight container at room temperature.