Here's a cookie recipe to get you in the mood for Halloween (side note: isn't it interesting how, in the past 10 years or so, Halloween has become a massive holiday for adults?). They're Dulce De Leche Bat Cookies, from Martha Stewart Living.

The recipe calls for an aspic cutter to make the bat shape. I've never used an aspic cutter before, but if Martha says you have to...

Conveniently, even if it isn't Halloween, these cookies would be good for your next Batman-themed party.

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.