I use a stand mixer with the paddle attachment, mix the butter and caster sugar together until combined. This will take 1-2 minutes in an electric mixer (I use speed 3).
Add the dry ingredients (Baking Powder, Salt, Bicarb, Plain Flour, Cornflour and Chocolate) into the bowl and mix for 30 seconds.
Add in your egg, egg yolk and golden syrup into the mixture and mix until a cookie dough is formed (the dough will start coming away from the bowl which means it is ready!)
Divide the dough into cookie balls, I weighed the dough out to make each cookie 110g-120g each!
Place them on a lined baking tray, or into a container lined with baking paper. Chill them in the freezer for 1 hour.
While your dough is chilling, pre-heat your oven to Gas Mark 5/190c/170 Fan.
Once chilled and your oven is pre-heated, place the cookie balls onto lined baking trays, leaving space (at least 2") between them to spread slightly. I fit 6 cookies onto my tray but you could bake your cookies in batches!
Bake for 14 minutes, remove from the oven and leave the cookies to cool on the baking tray completely before moving. Your cookies will continue to cook once removed from the oven which makes the best gooey, soft and chewy cookies!
If your cookies have spread slightly, use a round cookie cutter to gently swirl them back into shape while they are still hot.
Once cooled, eat one of those delicious cookies (if you was able to resist from eating one straight out of the oven!)
