Preheat the oven to 300°F (150°C) with a rack in the middle position.

In a bowl, mix together the flour, cornstarch, and baking powder, then set aside. (The baking powder will make the dough lighter, but too much will cause the designs to disappear during baking.)

In the bowl of a stand mixer, add the softened unsalted butter, powdered sugar, and vanilla sugar.

Scrape down the sides of the bowl to make sure the mixture is even, then beat for another minute on high speed.

Attach the disc of your choice, press the lever down fully to pack the dough. If a little dough comes out, remove it. Now you can start making the cookies.

Do NOT use parchment paper or grease the baking sheet. The surface needs to have some grip, or the cookies won't release properly. Use a metal baking sheet (directly on the metal) or a Silpat mat, as long as it's not too worn.

To make the cookies, place the press firmly on the baking sheet and press the handle down once. Lift the press and the cookie will stay on the sheet. That's it! Beautiful cookies in ten seconds!

Bake for 15 minutes. (If you placed the cookies directly on a metal baking sheet, baking time may be shorter—about 13 minutes in my oven.)

Enjoy!