Heat your oven to 170C. In a bowl mix together corn flour, flour, baking powder, cinnamon and salt then set aside.
Then add your butter and sugar to a stand mixer fitted with a paddle. Cream together for about 2 minutes until combined and pale. You might need to scrape down the sides of your bowl half way through.
Add in the egg yolks, brandy and vanilla and beat for another 2 minutes.
Add in the flour mixture and mix together on the lowest speed until combined and uniform.
Divide the dough into two pieces and roll out one piece between two sheets of baking paper until 1/2 cm thick. Cut rounds out with a cookie cutter and carefully place the rounds onto a baking paper lined tray 2 cm apart from one another. Repeat this process until you've cut out all your dough. You will need about 3 trays if they're a similar size to mine.
Bake for 12 minutes, turning half way if your oven cooks unevenly. Cool completely then sandwich two cookies together with a small teaspoon of caramel. Enjoy!