Add the flour, butter, powdered sugar, cornstarch, and vanilla to a deep mixing bowl.
3 Begin mixing the ingredients using electric beaters at their lowest speed. Once the dry ingredients begin mixing with the butter and are not dusty anymore, increase the speed to medium.
4 A few minutes later, the dough will start to look like sand. Keep beating the dough for another 4 minutes and it will start to come together.
5 
Once the dough comes together and your beaters start straining, increase the speed to high and beat the dough for another 3-4 minutes, or until it resembles thick whipped cream.
6 
Drop small shortbread balls of dough onto a non-stick cookie sheet. Use a fork to gently press each cookie down in the middle.
7 Add glace cherries or sprinkles to each cookie, as desired.
8 Bake cookies in the middle of the oven for 15 minutes.
9 Let the cookies cool for 5 minutes and transfer them to an airtight container to maintain the optimal freshness.
