If cookies are in fact the same as what we call biscuits, you can basically make a crumble mixture (2 parts flour, one part butter, one part sugar, plus any adjuncts you want) then bind it in your hands like you would a snowball, then roll it into a thick sausage, cut quarter-inch-thick discs out of the sausage, and bake them at 160°C for between 15 and 30 minutes depending how good your oven is. They harden as they cool. Easy peasy.
If cookies are in fact the same as what we call biscuits, you can basically make a crumble mixture (2 parts flour, one part butter, one part sugar, plus any adjuncts you want) then bind it in your hands like you would a snowball, then roll it into a thick sausage, cut quarter-inch-thick discs out of the sausage, and bake them at 160°C for between 15 and 30 minutes depending how good your oven is. They harden as they cool. Easy peasy.