Preheat the oven to 180C.
Place the granulated sugar on a small plate.
Take one half of your cookie dough out of the fridge and divide into 12 pieces. Roll each piece into a walnut sized ball. Roll each ball in the sugar, then place them on a lined baking tray. Dip the bottom of the glass in the sugar and use it to lightly press down on the cookies to flatten them slightly.