Preheat oven to 160°C (fan forced) and line 4 large flat trays with baking paper. Set aside.
Place honey, butter and vanilla into Thermomix bowl and melt 5 min/50°C/speed 2.
Add sugar, egg whites and flour and blend 5 sec/speed 5. Scrape down any remaining flour from sides of bowl and incorporate using your spatula.
Spread the mixture, dividing between the 4 trays equally and spread to a rectangular shape with spatula. The thinner you make it the better, the more crunchy and the more wafer real estate you have for nuts and chocolate!
Sprinkle generously with chopped macadamias and chocolate.
Cook 20-30 minutes or until dark golden and centre is set. This will vary from oven to oven and you should watch it carefully. It is ready when the centre is set and the colour is as dark as you dare!! Only cook two trays at a time and turn trays half way through if needed.
Cool on trays completely before breaking into pieces. Store in an airtight container in the fridge for best crunch factor!