- Whisk together the flour, baking soda in a bowl 
- In a stand mixer with paddle attachment cream butter until light and fluffy , then add coconut shortening until evenly mixed together. Add sugars and beat for 3 mins on low speed. Mix in vanilla 
- Add eggs one at a time until just incorporated 
- Add flour mixture and just work in the mixture. I actually do this by hand to prevent overmixing 
- Chop up block of chocolate into small squares then mix into dough, 
- Scoop cookie dough out and place on baking paper lined tray. I use a small ice cream scoop to get similar sized portions  
- Refrigerate for at least 30 mins-but they improve the longer you let them sit . At this point you can freeze the dough.  
- To bake- heat the oven to 180C 
- Remember to spread out the cookies out so they don't merge together. 
- The secret to these cookies are to literally bang the pan while cooking. I do it after 4 mins then again after another 4 mins then at the end. The total cooking time will be between 12-15 mins. 
- Allow to cool slightly on tray then put on cooling tray.