Place eggs in a pot and cover with cold water, heat until boiling, then remove from heat and let sit 8-10 minutes. Place under cold water. Remove shell when cooled, separate the white from yolk and mash just the yolk part, well with a fork.

In a food processor whisk together flour, sugar, salt, corn starch and zest, then add cold butter and vanilla, pulse a few times to mix, add egg yolks and pulse until almost combined, move to a lightly floured flat surface and knead gently until combined. Wrap in plastic wrap or parchment paper and refrigerate for at least an hour or two or even overnight.

Pre-heat oven to 335° (170° celsius). Line 2 cookie sheets with parchment paper.

Remove dough from fridge, on a lightly floured flat surface, start with rolling out half the dough to 1 centimeter thickness and cut with a small to medium size flower cookie cutter, using a straw or any small round hole cutter**, cut a hole in the middle of the flower. Place cut out flowers on prepared cookie sheets and bake for approximately 12 -14 minutes, cookies should not brown. Let cookies rest 5 minutes then move to wire racks to cool, then dust with powdered sugar. Enjoy!