Line 2 large baking sheets with parchment paper and set aside.
In a large bowl, stir together the butter and the sugar until just combined: unlike in other recipes, to not beat until light and pale.
Stir in the flour, switching from the wooden spoon to your hands once the dough becomes too hard to work with, bringing the mixture together in your hands. Don’t worry if it is quite crumbly!
Generously dust a clean countertop with flour before rolling out the dough to a 1/4 inch thickness. Using a round, medium-sized cookie cutter, cut out rounds of the shortbread, carefully transferring them to the prepared baking sheets. Bring any scraps of dough together into a ball, roll out and repeat until you either run out of dough or space on the baking sheets.
Prick each cookie twice with the prongs of a fork before chilling for at least 30 minutes, but up to a day ahead. Meanwhile, preheat the oven to 285F.
Bake the shortbread in the middle of the oven, rotating the trays halfway through for 30 minutes, checking them at the 20 and then again at the 25 minute mark: if they’re starting to color at all, remove them from the oven and leave to cool on the baking sheets.