In a large bowl, mix flour, corn starch, powdered sugar, cardamom and salt.
Add in butter and mix using a electric hand mixer until fully combined.
Add in milk and mix until it forms into a dough. Use your hand to knead the dough if needed. Knead the dough until it's smooth and form it into a ball.
Form the dough into a log about two inches in a diameter and wrap in a plastic wrap. Refrigerate for one hour.
Preheat the oven to 350F. Line a baking sheet with parchment paper.
Take the cookie dough log out of the fridge, place it on a cutting board and cut slices of cookie dough about ¼ inch thick.
Place the cookies on the baking sheet and bake in the oven for 12 minutes until they'r slightly golden on the edges and at the bottom.
Let the cookies cool for 10 minutes then transfer to the cooling rack.