Preheat oven to 325 degrees F. Line baking sheet with parchment paper.

In the bowl of a stand mixer with the paddle attachment, add cool unsalted butter, sugar & salt. Turn mixer on the lowest speed available to avoid incorporating air into the dough. Air will cause spreading. Mix until it starts to incorporate.

Add 2 cold eggs & vanilla. Turn mixer on to the lowest speed & mix just until the eggs & vanilla have incorporated into the butter & sugar. It will still look sort of lumpy or curdled but thats alright as long as there s no big chunks of butter. Scrape down the bottom & sides of the bowl. If needed, mix for a few more seconds.

To roll the dough, place a piece of parchment paper lightly sprinkled with flour on worktop. Use two pieces of 3/8 inch thick wood as guide (for thickness - cookies will have uniform/even thickness). Roll the dough placed in between these two wooden sticks. Cover dough with another parchment on top before rolling so dough wont stick to the roller. See pic below.

After removing from the oven, let the cookies set on the cookie sheet for 2-4mins. Move them onto a cooling rack to cool completely. Tips: let cookies sit in a container on a paper towel overnight before decorating. This will help grab any extra butter so you don’t get that dreaded “butter bleed” after you’ve spent days decorating them.