Add your butter and sugars to a bowl and beat until creamy - I use my stand mixer with the beater attachment!
Add in your egg, and beat again. If using the vanilla, add it in now!
Add in the plain flour, cocoa powder, baking powder, bicarbonate of soda, and salt and beat until a cookie dough is formed!
Add in your chocolate chips and beat till they're distributed well!
Weigh your cookies out into eight cookie dough balls - they're about 115-120g each!
Once they're rolled into balls, put your cookie dough in the freezer for at least 30 minutes, or in the fridge for an hour or so!
Whilst the cookie dough is chilling, preheat your oven to 180C Fan, or 200C regular! If your oven runs hot, go for 160C-170c.
Take your cookies out of the freezer/fridge and put onto a lined baking tray. I put four cookies per tray!
Bake the cookies in the oven for 12-14 minutes. I don't personally flatten the cookies, as they flatten enough during baking - however, if you like flat cookies, flatten them a bit before baking.
Once baked, leave them to cool on the tray for at least 30 minutes, as they will continue to bake whilst cooling!
ENJOY!
Notes
These are best eaten on the day of baking, but can be revived by microwaving for 15-30 seconds, or putting into a hot oven for 2-3 minutes!
You can freeze the raw cookie dough easily, and bake from frozen if you don't want to bake the entire batch!
If you are baking straight from frozen after some time, I usually bake for the same 12-14 minutes, at the same temp, but an extra couple minutes won't hurt!
If your oven runs hot you will want to reduce the temp slightly as mentioned in the method!
If you prefer your cookies flatter, you can squish them down slightly before baking but I don't do this personally!
If you can't access one of the sugars, use all of the other one - i.e. all granulated, or all light brown sugar. Using other sugars can change the texture.
You can make them smaller by splitting the mixture into 12, and bake for 9-10 minutes!