#1 Beat sugar and butter in an electric mixer until light and fluffy. Add in egg yolks, milk, and vanilla. Mix to combine. #2 In a separate bowl sift flour, cornstarch, baking powder, baking soda, and salt together. #3 Add flour mixture to butter mixture, mix until dough comes together and is just combined. #4 Divide the dough into two portions and roll each piece into a 2-inch-thick log. Wrap in plastic wrap and place in the fridge for 1 1/2 hours. #5 Preheat oven to 350°F. Line several baking sheets with a non-stick baking mat or parchment paper. #6 Cut log into ¼ inch thick slices and place on baking sheet 1 inch apart. #7 Bake for 10 minutes or until edges start to brown. Remove from oven and transfer to cooking rack to come to room temperature completely. #8 Scoop Breyers Dulce De Leche ice cream into small 2 inch scoops. #9 Place Dulce De Leche scoop on underside of cooled cookie, then sandwich together with another cookie. Continue until all cookies are used. #10 Optional – drizzle dulce de leche over the top of cookie sandwich. #11 Eat immediately or place in freezer until ready to eat. #12 If you are short on time and would like to enjoy this type of ice cream cookie sandwich a great substitute would be store bought shortbread cookies, or Sandies, or Wedding Cookies.