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Dulce De Leche Bat Cookies

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

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 a 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 on "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 tsp dulce de leche and a cutout cookie.