These Dark Chocolate Alfajores feature light as air butter cookies filled with homemade dulce de leche, covered with dark chocolate and finished with a sprinkling of sea salt.
Preheat oven to 350°F. Combine flour, tapioca starch, powdered sugar, salt, baking powder and butter in the bowl of a food processor. Pulse to form a fine and sandy meal, then add egg yolks and continue processing until the dough balls up around the blade. Turn out onto a lightly floured surface and roll into two balls.