Concha Christmas cookies are Mexican inspired cookies that are soft with warm pumpkin spices on the inside and a crisp buttery masa harina shell on the outside.
Heat oven to 350 degrees F. Line 2 baking sheets with parchment paper.
For pumpkin spice cookie: in a medium bowl, whisk the flour, baking powder, salt and spice until blended; set aside.
Using an electric mixer, in a large bowl, beat the butter and sugar until light and fluffy, about 2 minutes. Add the pumpkin, egg, and vanilla and beat until combined.
Gradually add the flour mixture, mixing until just fully combined.
Using a cookie scoop, drop 1½-inch balls of dough onto prepared baking sheet, about 2-inches apart. Place baking sheet in refrigerator while preparing cookie frosting.
In medium bowl, with an electric mixer, beat butter and sugar until creamy. Add flour and masa harina; continue mixing for 2 minutes or until large clumps form and mixture can be formed into a ball with your hands.
Divide dough into 36 (1-inch) balls. With your fingers flatten each ball into a 1 ½–inch round.
Remove cookies from refrigerator and gently press 1 round over the top of each cookie.
With the tip of a sharp knife score each cookie shell to make a decorative pattern.
Sprinkle each with sparkling sugar.
Bake for 15 to 16 minutes or until cookie edges are lightly brown.
With a round cookie cutter, trim cookies for perfectly shaped rounds, if desired.
Transfer cookies on parchment to cooling rack. Cool completely.