Melt the butter and take it to a nut brown stage you'll be able to smell it when it changes remove from the heat immediately
Add to a mixing bowl with the brown sugar and caster sugar then allow to cool before adding the egg and egg yolk
Add the vanilla and miso paste
Sieve in the flour and bicarbonate soda then fold it through until the dough forms
Roll into balls a little bigger than a golf ball then freeze for 15 mins before baking at 180c for 10 mins. Make sure they have plenty of room to spread out.
