Pre-heat the oven to 150ºC / 302℉.
Grease a small, round pan (I used a 6" spring-form, but you could pretty much use any size and then adjust the baking time).
Beat the butter and sugar together until light and fluffy.
Combine the flours and stir into the butter/sugar, mixing until a dough pulls together. Scrape the last bits together with your hands.
Press the dough into the prepared pan and push out so it covers the whole pan.
Take the back of a spoon and smooth the top until it is even.
Decorate my pricking the dough with a fork all over.
Score lines into the dough (almost all the way through), as this will help cut the shortbread later.
Sprinkle a little sugar over the top.
Bake for around 30-35 minutes, just until the edges are browning but the rest still looks pale.
Cool for ten minutes or so, then cut through the scores you made before baking.
Allow the shortbread to cool completely before moving them. Enjoy!