Pre-heat oven to 350F (180C). Line 1-2 baking sheets with parchment paper.
In a large bowl whisk together the flour, cornstarch, powdered sugar, salt and baking powder, add the vanilla and butter and combine with a fork until it resembles coarse crumbs, add the zest and yogurt, mix until almost combined then move to a flat surface and gently knead to form a soft smooth dough. Don't overknead.
On a lightly floured flat surface roll the dough to ¼-⅓ inch (½ cm) thickness and cut into desired shapes with cookie cutters. Place the cookies on the prepared baking sheets and bake for approximately 10 to 12 minutes or until golden around the edges. Let cool 5 minutes on the baking sheets then move to a wire rack to cool completely before drizzling or dipping with chocolate or dusting with powdered sugar before serving. Enjoy!
Notes
I made the cookies about 1/3 of inch and got 13 cookies if you make them thinner you will get about 20 cookies.This recipe can be made either by hand, with a stand mixer with the paddle attachment or even a food processor.If you wish you could add some chocolate chips, chopped nuts such as walnuts, pecans, hazelnuts or even almonds. Instead of vanilla extract you could use lemon or orange extract.Store the completely cooled cookies in an airtight container at room temperature for up to two days or in the fridge for up to 7 days. They can also be frozen in a freezer bag or container for up to 3 months.