Heat the oven to 180 °C and line 2 large baking trays with baking paper.
Place the butter and sugars in the bowl of your free-standing mixer and cream together using the beater attachment. Alternatively, whisk together in a large bowl with a handheld whisk.
Next, add in the egg, water and vanilla paste and beat again until combined.
Weigh out the remaining dry ingredients into a large bowl and mix well.
Add the dry ingredients to the wet, and either with the beater attachment on minimum or with a wooden spoon, mix together thoroughly.
Using a dessert spoon, place spoonfuls of the cookie dough onto the lined baking trays, ensuring they are well spaced out. If you have only one tray you will need to bake in 2 batches.
Bake in the pre-heated oven for 15 minutes, if using 2 trays switch them around in the oven after 10 minutes. The cookies are ready when they turn a lovely golden.
Remove from the oven and leave to rest for a couple of minutes before using a palette knife to slide them onto a cooking rack. You can cool completely, but normally a couple of these will go missing from the rack before that happens!