Line a baking pan with some parchment paper and preheat the oven to 350°F (175°C).
Put all the ingredients into a medium bowl.
Using a hand electric mixer, mix the ingredients until you get smooth batter.
Using all of the batter, make 12 ball shapes and place each onto the baking pan, lined with parchment paper. If the batter is too soft (which happened in my case), put it in the fridge for half an hour or so.
Take some boiling water and dip a fork into it, then press down the tops of the balls to make a cookie shape. Repeat for every cookie (re-dip the fork each time).
Bake the cookies in the upper portion of the oven for about 9 minutes. As every oven heats a bit differently, watch carefully for browning so the cookies don’t burn.
When the cookies are done baking, put them on a cooling rack and let them cool down completely. They will slowly turn green with cooling, and turn even darker green as they sit.