Dulce De Leche Bat Cookies

Makes 18
3/4 cup all-purpose flour, plus more for dusting
1/4 cup unsweetened Dutch-process cocoa
3/4 teaspoon coarse salt
1/4 teaspoon baking powder
2 tablespoons unsalted butter, room temperature
1/4 cup granulated sugar
1/4 cup packed light-brown sugar
1 large egg plus 1 large egg yolk
4 ounces semisweet chocolate, melted and cooled
1/2 teaspoon pure vanilla extract
1/4 cup plus 2 tablespoons dulce de leche

Directions

Whisk together flour, cocoa, salt, and baking powder. Beat butter and sugars with a mixer on medium speed until pale and fluffy. Beat in egg, yolk, chocolate, and vanilla. Reduce speed to low. Add flour mixture, and beat until just combined. Shape into a disk, wrap in plastic, and refrigerate 1 hour.

On a lightly floured surface, roll out dough to 1/8 inch thick. Cut out 36 rounds with a 2-inch cutter, and space 1 inch apart on parchment-lined baking sheets. Using an aspic cutter set, cut a triangle, point side up, in the center of half the cookies, and then use the half-moon cutter to make one "wing" on each side of the triangle. Refrigerate 30 minutes.

Preheat oven to 375. Bake until set, 7 to 9 minutes. Let cool. Top each uncut cookie with 1 teaspoon dulce de leche and a cutout cookie.

Dulce de Leche or Confiture de Lait

Preheat the oven to 425° F (220° C).

Pour one can (400 gr/14 ounces) of sweetened condensed milk (not evaporated milk) into a glass pie plate or shallow baking dish. Stir in a few flecks of sea salt.

Set the pie plate within a larger pan, such as a roasting pan, and add hot water until it reaches halfway up the side of the pie plate.

Cover the pie plate snugly with aluminum foil and bake for 1 to 1¼ hours. (Check a few times during baking and add more water to the roasting pan as necessary).

Once the Dulce de Leche is nicely browned and caramelized, remove from the oven and let cool. Once cool, whisk until smooth.

Store in the refrigerator until ready to serve. Warm gently in a warm water bath or microwave oven before using.